Hi!
I saw the 60D hack this weekend and decided to take it for a spin at a real fieldtest.
At the time when I installed it on my memorycards, the update#2 was the latest version of the hack, so I don't know what have changed since then.
See my fieldtest in the video below.
I present to you:
Khoma at Gröna Lund in Sweden.
(Tamron 17-55mm 2.8 / ISO 200, 1/50, 2.

So I took my camera and three SanDisk Extreme 16GB 45MB/s, and one SanDisk Extreme Pro 16GB 95MB/s.
There proved to be no difference between that cards, since - as you know - the 60D only writes at a maximum speed of 20MB/s.
I filmed in 1280x544-resolution, in which I knew I wouldn't be able to record continuously - but I wanted to see how it would work out anyway.
My pre-tests showed that I could record 615-frames in that resolution on my memorycards - but what did surprice me was that I do have a few shots with over 670-frames. Don't ask me how that happened - all I know that it wasn't on the 95MB/s-card.
So what did I find out? Some of you may already have posted about this - I haven't read all posts.
The last shot on the card gets corrupt - It displays some error with the Header-or-something when the memorycard gets full, and the last shot does not convert to DNG at all.
The camera does not realize that the memorycard is full - It says [999]-exposures left even though the card is full
That's basically it. The 24-second clips those 615-frames provided for proved sufficient enough for a nice video, though I did miss a few opportunities waiting for the buffer que to empty. In this case the crop was no issue, rather the opposite.
It's all in all a decent raw-video-camera. Since most of us only produce for Vimeo or Youtube, not having FullHD raw isn't going to make this camera useless, I argue that the post-editing abilities of raw is a far more valued option, than having crappy lossy h264 in 1080p.
The upscale hides well in the 5MB/s compression on Vimeo anyway.