Strengths: Dynamic range, high-ISO performance, large LCD, live view, live histogram.

Weaknesses: Bottom buttons activate unintentionally, mildly weather resistant.

Summary: The 40D is a worthy upgrade from my 3 year old 20D. I see more details in high-contrast images thanks to the 14-bit converter and highlight tone priority. High-ISO performance is slightly better than the 20D despite a 2MP increase. The much larger LCD is welcome, especially for manual focus using live view. Live histogram helps with proper exposure for high-contrast images. The new ISO button position, coupled with ISO in the viewfinder, makes it a snap to change ISO without taking your eye off the image. There is much praise for Nikon?s ergonomics, but I personally prefer the Canon grip. On the downside, moving buttons to the bottom of the LCD makes them prone to accidental activation by bumping into my body. ?Sealing? around the CF and battery doors probably won?t do much for weather resistance, though this has not been a problem for the 20D. Highly recommended.

Strengths: Speed! For a pro-sumer grade camera, this thing is fast. I had a 30D and upgraded to the 40D. Custom User Settings.

Weaknesses: Since I have only recently switched to SLR camera's, I am still a big fan of the live view...I am not impressed with this function!! Can't use it with Auto-Focus, so pretty much USELESS!!

Summary: I absolutely love the Canon EOS series camera's. If you are considering a Canon XTI Rebel...don't! The mode wheel alone is worth the extra money, the mode wheel makes changing camera settings easy--no need to look at the menu to change the settings...you can change them on the fly. Dust reduction system should be useful, but I haven't had time to verify that the camera is better because of it. I take a lot of pictures of my son's ballgames and this camera is awesome for that! Would have been PERFECT if the live view mode worked in auto focus mode---some people would say it doesn't matter, but for those of us that grew up on point and shoot...IT DOES! I guess that is the sacrifice you make for image quality and the creative ability you gain by going to a SLR. All in all, image quality, speed and ergonomics of this camera make it a great camera...even though I have a few minor complaints--mostly live view, I still give this camera 5 stars!

Strengths: Pretty much everything. Easy button opperation, and great controls. Clairety and picture are great.

Weaknesses: Takes a good bit of reading to know how to work everything. Some simple things take a while to figure out. Like pop up flash and manual modes, but that is expected.

Summary: Its brand new and it is leaps and bounds over the 30d. It is similar to the XTi but still better. More weather durable and more pro-type handling. Shutter speed is amazing, and has many many modes. I like shooting black and white and sepia and it is great with them. It is a little pricey but if you plan on using it not just buying it to look at and let collect dust I'd say go for it. Watch out buying the cheapest one online because its a non-us version, it will have a plastic frame and has no warrantee.

Strengths: 9 cross-type AF sensors all sensitive to f/5.6; faster and deeper buffer; EF-S and EF lense compatibility; great looking ISO1600 shots; 6.5fps; instant-on; large playback LCD; liveview; custom dials

Weaknesses: Comparing it to higher priced cameras, several. Comparing it to lower priced cameras, none. I wish this had 8fps or 15AF points, but you can't have your cake and eat it, too.

Summary: I just purchased this camera after deciding it was time to move up from a 10D. I can say that the 3" screen, while nothing special at first, is truly something to behold. Live view was neat, and I could see situations where that would come in handy. Overall, people need to determine what the features they need are, and purchase what accomodates those needs. This camera satisfied my needs, and I am glad I got it.