I bought one of these for my EOS 50D back in 2008 and loved it. Ended up selling my camera gear due to getting laid off. Recently bought an EOS 60D with the kit 18-135 lens, and although the 18-135 is a nice lens considering its extreme zoom range, it had this kind of nagging softness sometimes, and the AF is very slow. I picked up a very slightly used 17-50 non-VC from a local seller for a great price and am just as happy with this one as I was with the last one. No focus issues at all. This is a mighty fine walk-around lens.