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I have a Q:

I thought I'd try recording at 35fps to see if it's of much use as slo-mo, but when I change the desired frame rate to 35, the actual frame rate only changes to 27.17fps. Does this only work with certain other settings?

@fredoviola

I'm a noob here and have only just started shooting ML, but I'm in the same boat trying to get my head around all this stuff and get more involved so will attempt to answer these Qs based on my limited understanding, so please take them with a pinch of salt!

I do not have a USB3 port.  My computers are two pre-2010 laptops and a mid 2012 Mac Pro.  I use the Lexar FireWire 800 reader.  Does this already make the upgrade something I should avoid? 

The process needs a high speed 1000x card which you are meant to run with an UDMA7 compatible card reader which is where the USB3 card reader comes in. Because of the high data rates involved, USB3.0 seems the safest bet.

As well, I have been researching which CF to get... What is the difference between the Lexar 1000x and Lexar 1066x?  The price is lower on the 1066, so I wonder if there is something different about this card that would not work with MagicLantern raw? 

Anything 1000+ is supposedly OK. Price doesn't necessarily equate to quality. The lexar cards seem vastly more expensive than the Komputer Bay cards that a lot of people here seem to use.

The resolution of the movie is lower than if I use standard Canon firmware.  How does that work?  Is there not a loss in quality when the resolution is scaled up ever-so-slightly in post?

The frame height and width are lower but the bit rate and bit depth are much, much higher, so even after you upscale you will still have tons more data in the RAW image than you would in canon's true 1080p h264. The h264 footage also has a list of things applied to it which are seemingly undesirable.

I am an audio visual artist and shoot experimental videos.  A friend of mine who color grades for a living mentioned that the only thing he'd change about my output would be the camera, to avoid the h264. 5D-ness that has become a part of my work.  I agree with him. I really don't dig the glowing reds and in post there is only so much that can be done to grade the image.  Would this firmware update be a good solution?  I worry when reading about corrupt frames, etc...

ML is a whole new way of working so it'll take some time to adjust to it, I'm basically having to relearn everything I've learnt shooting on 5D/7D for the last few years. But yes, you would have vastly more colour information for grading.
Seems like people with corrupt frames, etc. are in the minority and usually haven't for the correct settings or the latest build.

This forum has so much information and it's all so tech-y that it's a bit of a struggle for me.