Well, I got my DS3 a few days ago, and as i've stated in another thread i started, it won't--can't--balance plain old household socket type fluorescent lights. It continues to have a very yellow cast in both fluorescent WB mode and AWB. I shot the same scene with the same lens on my 5D and the 5D did a spectacular job with WB in AWB mode.
I've also noticed what I believe is a problem in it's evaluative (main) metering mode--it seems to be blowing highlights that my 5D never does.
I'm going to try and dial in the fluorescent mode manually using manual WB adjustment. If that doesn't work--back it goes because I can't trust it to be correct in other areas either. Not only that, but it would be quite an argument to say that the WB on the 5D outperforms the WB of the DS3 when in AWB or fluorescent when correcting for fluorescent light.
also, when you buy cameras, many stores only give you a 15 day return, such as B&H. However, I'm not sure what the return policy is on the 1DS3. I suppose if I get it back before two weeks, I'll get a replacement from B&H.
But I agree that the warranty for an 8, 000US camera should come with a replacement in the first year--not tear it apart and send it back repaired, when it's something as serious as the entire board being bad. If it just needs an adjustment, I can see that I suppose. Then again, when I build my own computers, if the main board goes bad, I just get a new MB, so I guess that's in line with all things digital these days.