So I shipped off my trusted lens yesterday. It was my most-used lens, and the one that brought in the $ to pay for all my other gear, plus some. I'll admit, the reason for my upgrade was 80% pride--wanting the best of the best. The other 20% was for the image stabilization...a rational reason. Leaving it with the shipper yesterday was quite tough, because I was giving up a lens that never disappointed me. After owning this lens and using it in extreme conditions (low light, requiring fast AF), I would certainly recommend this lens to anyone who wants a Canon 70-200 f/2.8L but is on a tight budget. This Sigma is certainly a steal. I've owned my share of crap Sigma lenses, and this is certainly not one.