I had a T1i before my 60D, and the viewfinder really surprised me at first, I remember being in love at first sight-ing. I also wanted the rigidity of the 60D, the rebel flexed and creaked when I manipulated it with one hand and a 300mm Lens. Most people dont have the ape-like rock crushing mitt's that I do, and wouldnt swing a 300mm lens around one handed, but when I am busy messing with gear things get held in 1 hand. I also liked the larger deeper 60D grip. Battery life in actual usage increased a ton also, with the rear screen not being needed to shoot. 60D has a decent amount faster shutter rate than the rebel did, providing you have enough light to meter correctly and use one-shot AF, the tracking AF slows it down a lot. I swear the 60D has more DR also, alot less of my shots with a sky in the background are blown-out I have noticed. Maybe I got better at shooting, but I doubt it :-P.