I purchased the Digital Rebel XTi/400D as a replacement for the original Digital Rebel 300D. I was drawn to this camera by features and price. The self cleaning sensor, extra megapixels (10.1) and amount of shots one can take in a burst (10 RAW, 27 Jpeg at 3 per second).
I preordered mine without handling an XT first, which was foolish as they're nearly the same size. I was just too hot to trot, I suppose. Fortunately, I spent the extra money on the BG-E3 battery grip when I picked my XTi up.
Without the battery grip, my lower two fingers have nowhere to rest. With it on, it's just enough to grab on to, but it's still a bit small for my liking. I'm also not thrilled with the design of the BG-E3 and it's removable magazine as compared to the BG-E1's flip down door, but that's best saved for another review.
Build quality seems very good, it dosen't feel cheap despite being plastic.
Some folks are upset about the way the display shows the settings and is "always on". It's easy enough to press the display button to turn it off after settings have been adjusted. I also hadn't noticed this causing an ususual drain in battery power.
Overall, I'd say this is a great digital SLR for a prosumer or casual user. I'd steer photographers interested in this camera toward the 30D instead.