I started this topic as it seems that Canon has offered to us a product that is not as tightly controlled as it has been in the past.
I would like to say that the following is my opinion based ONLY on my VERY limited direct observations and the conclusions drawn from reading nearly all I can here and on other sites. I take info gained from Internet sites with a huge grain of salt but trends are often easily seen so overall it has some bearing on this discussion.
I am the proud, early on, owner of a 50D and a 4yr+ owner of a 20D.
I took the better part of a day to test my 3 lenses to see if I could be benefited by dialing them in on the 50D using the micro adjustment tool on the 50D.
I found that all 3 needed adjustment on the 50D and all 3 were spot-on, on the 20D. This lead me to conclude that 4+ years ago Canon needed to be tight as far as AF adjustment from the factory but since they added Micro Adjustment they could loosen up a bit and let us do their work for them.
Thankfully these 3 lenses could be dialed in perfectly so I am so glad that there is MA on the 50D body and will never buy another body without it.
Folks are also reading about the black dots issue 5D2 and after a lot of whining Canon seems to have fixed it. Canon IMO had to have seen this as the pics on their own site had it for all to see. Now there are folks having to deal with water damage even when using Kata covers water protection. Canon is playing hard ball on their warranty and IMO this is just not acceptable.
It is always true that any model when released will have some teething pains and we are, all too often the paid on our own dime, BETA testers.
However, Canon IMO is not doing the fine level of QC that they have done in the past. The MKIII focusing issue is another example. There are other examples out there as well and I could care less about other brands as I shoot Canon so they get my comments/attention.
I know the the early grip for the 20D sucked as I have one but never sent it in. Since it added so much weight which I did not like I will not use one ever again. I like to keep the weight in the lens if at all.
So here is the opportunity to add your thoughts too. I hope Canon is reading here as they have done so many things right. The one thing they cannot afford to do IMO is shove stuff out the door and leave it up to us to catch it and or force them to own up and fix it. This stuff is far to costly to have to second guess every purchase. Other brands have caught up and or passed Canon in some areas. Canon cannot afford to rest on their Laurels.
OT but worth mentioning, Canon should offer their 45 point AF and full weather sealing in the 5dMKIII and it should have been in the MKII.
Shame on you Canon! 
The 45 point AF should have been on the 50D too.
I for one will never own a EOS1 type body as IMO they are too costly but even more importantly too heavy.
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I don't appear to have been charged any extra for plastic hoods on my glass; they appear to bit's of plastic that come with the models, and fit
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