The Canon EOS 600D / Rebel T3i is virtually identical its predecessor, with a few tweaks to accomodate the new vari-angle LCD screen. It is a fairly small camera with a largely plastic shell and a pretty narrow, mildly uncomfortable hand-grip.
The emphasis is on the word mildly, though - in actual use, the size and shape of the grip proved not to be too much of an annoyance. In terms of build quality, the Canon EOS 600D / T3i certainly feels solid enough for a consumer-grade DSLR, although not in the same league as the semi-professional EOS 60D and 7D models. Like all of Canon’s APS-C digital SLR cameras, the EOS 600D / T3i is compatible with the manufacturer’s entire line-up of lenses, including both EF and EF-S glas.