I know there were a few quirks with the 5D but everybody I know that has one thinks it's the best thing since sliced bread...
As for complaints about it only being 3.9fps... 1Ds MkIII is only 5fps. I wonder how much it will cut into their 1 series sales?
I am anxious to see how the images look... I have shot a 1Ds III and found the images to be a bit noisy in certain situations (just nitpicking here). The new 5D chip with micro-lenses and Digic 4 processor might do something to change that (look at hi ISO samples on the new 50D. Quite good!). I wish it was 16mp, too, but I hear they are trying to roll them off the same line. The huge 21mp sensor in the 1Ds made even my "L" series glass look a tad soft... Oh well, Zeiss makes glass for our Canons now!
I'll take one of each, sir.
Personally, I think it is going to rock and I can't wait to get my hands on one.