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I'll write down all my settings and you can test them on your camera.  We're prepping for storm flossie right now, so once I lock in, I'll post up

Yay, that sounds promising.   
Thank you sir for keeping us updated.

unusable = the DSLRs displaying "Card1 cannot be accessed - reinsert\change card"

Thank you for clarification.
Ok that sounds like a clear return. But I think this was your problem: http://www.magiclantern.fm/forum/index.php?topic=5510.msg61818#msg61818
I wish you more luck with the next card.

My card from amazon.de arrived after a week and I was finally able to test it. The card can perform well at recording 1080p 24 and 25, however there is an issue with heat on the card. After recording a couple of GB (~20gb) the card seems to become so hot that it turns slower and finally starts to drop frames. This is 100% reproducible on the card I have. I think I will return it and test another to verify this behaviour. This does not happen with my 64gb cards from KompBay.

Hmm, but it could also be that the CF card has some blocks in the middle are not as good as in the beginning and end.
Because heat is normally a good thing.
What happens if you just format the card immediately after you have this dropouts from the 'heat' and start over.
If it then goes again for 20GB fine then you can rule out the heat.

>it was only readable on an Lexar dual slot usb3.0 reader on my windows7 Desktop.
>the speed was about 90MB WRITE / 120MB/s READ but unusable on the DSLRs

This is a known issue. You do not have a bad card.
Only USB 3.0 card readers work.
To avoid corruption the Komputerbay 1050x card will not allow to be read by normal card readers (might be a difference in voltage)
I ordered this one: http://www.amazon.de/Transcend-All--Multi-Kartenleseger%C3%A4t-schwarz/dp/B0056TYRMW/ref=sr_1_1

>Unusable on the DSLRs
That is bad, but could also have to do with your setting.
What you could try is change the Photo size to Medium instead of RAW to avoid.
Also you should be on p24 or p25 (PAL) @ 1920x1080.
This full resolution is it seems not possible with p30.
Format the CF card ExFAT to support large files.
Also the ML files should come from a seperate SD card.
And sorry for the stupid advice but probably you lost patience because of the other problems, when the CF card gets formatted sometimes my camera automatically switches to SD card. Make sure you are on the CF card 

Hello,

Let us share full resolution 1920x1080 success stories for Canon 5d mkIII   

Please post your CF card DNA:
- brand
- size
- UDMA
- 1080p24 or 1080p25 or even 1080p30
- when it was bought (seems to be important for computerbay) ?
- how many you have of it, did you have to exchange it?
- If you are close to continuous and get always > 2.5 minutes you could also put that here but please indicate.

Thank you.

I have mark III and sandisk 600x ( udma7 version) and it performs great. I am getting 1920x1080 24 and 25p continous. its only slighty slower than komputerbay 64 1000x but more predictible IMO. 1920x1080 30p gives about 600frames.

Great insight. 
I'd be really happy if that worked for me as well, but I have the sandisk 600x 32 GB version with UDMA6.
Full resolution is not possible but when I lower the resolution it is a fine card.

Thank you for motivating me, I tried several settings.

Update:
Ok I can do continuous with my card without zero framedrops or problems:
1920x764 p24
1600x900 p25 also with having global draw on
1728x864 p25
1472x828 p30 (for slowmo@70% that one is good to have)
1920x818 p24  worked for a while but at 3127, 3910, 3500 frames I had the 1st framedrop

On the display I can see values between 60,0 Mb/s - 62,9Mb/s.
With the card heated up it almost never goes below 62,2Mb/s
The predicted frames are not far off. All hacks enabled.

Anyways, when I have a faster card that gives me FullHD option then I will use this Sundisk card only for longer Canon H.264 Codec recordings on low DoF shoots.

--

I got this one (there were no UDMA7 one with the European retailers):
SanDisk CompactFlash Card (CF) Extreme Pro 32GB 90MB/s (SDCFXP-032G-E91/SDCFXP-032G-X46)
http://geizhals.at/eu/sandisk-compactflash-card-cf-extreme-pro-32gb-90mb-s-sdcfxp-032g-e91-sdcfxp-032g-x46-a462261.html

It seems you are lucky to have this one:
http://www.bhphotovideo.com/c/product/646876-REG/SanDisk_SDCFXP_032G_A91_32GB_Extreme_Pro_CompactFlash.html

This tip might be true or not.. but it seems reasonable:

If having problems with dropped frames try to set the size for the Photofunctionality to JPG large or even small.
Reason: http://www.magiclantern.fm/forum/index.php?topic=5656.msg45471#msg45471

If your using mkII, tough luck, It won't recognize ML on the card.

They work though on th mkIII since ML is running on the SD card NOT the CF.

I have just changed for the 5d mkIII.
Yes, thank you I know about using the SD Card.

My question is rather which card to get because at the moment I do not have any usable card only a Sandisk 600x.
I would love to have a go with a card that gives me no problems until the next generation is out.

Is there any save bet for 1080p25 as of now from this or other manufacturers?
Are the most recent 64GB 1000x the best ones?

I look forward a lot to the next generation 1200x or whatever it will be called.
Right now I'm waiting for my 1050x.

For some reason the speeds at the beginning of the test were slower..not sure why..but
--It was nice being able to roll continuously with no problems for over 30,000 frames, thats 24 minutes!

What I have heard a warmup of 1,5 - 2 GB makes the 1000x cards somewhat faster or reliable.
This might be a myth. However it could be a possible explanation.

We are looking at 120MB/s Write speeds cards (1200X) early next month on a trial basis. Mass production will be looked into once these pass the tests.

Wow, this progress would be absolutly amazing!

I'm eager to order 3 of those 1200X ones.
I hope they will come before November to match our production.

This speed really has enough headroom to make dropped frames something of the past.. probably also good for a suitable 1080p30 and a 720p50 option.

I just made the switch to Canon 5d mkIII just to use this hack. Been a happy Magic Lantern user since 2 years with my mkII

This new 1050x CF card product is extremly cool. Thanks for making this happen.
Also cool that KomputerBay talks to the customers!
Probably we could come around the USB2.0 card reader problem, when using a splitcable for USB that gives the device more power. I use this for example on my 3rd party CDrom drive attached to Macbook Air.

I'm currently trying to figure out how to get a proper reverse charge invoice when buying from amazon (Amazon would compute the right VAT but buying from a dealer registred with Amazon results in the wrong VAT making the product 19% more expensive).

Hope that my order works out soon.

Will post some tests as soon as I get 2 of the 128GB version cards.