erm how has my comments here shown negativity about the 2100? kindly quote. I think saying the way-newer 602 is slightly is slightly faster only is a COMPLIMENT. *think* about it. please, again, read in context, vs just doing keyword search in your mind. zealotry is good only in some areas, such as sales. so down boy! down!
also, AF is not IS is not AF. IS *is* meant to be laggy, that's what keeps the shakes off. You weren't meant to jack the camera around frantically with IS when shooting sports, uncle. That's the realm of high shutter speeds. IS still allows panning though, if you've realised.
I do post negative comments about equipment, especially those that I've personally used. those obvious faults (to me) are always cited. canon, olympus, nikon, etc, *when* I've used them until my curiosity is satiated. And I, although highly biased against stupid design flaws, eg G3, I do not have unrealistic demands against each thing that I try.
Eg I said my 50mm lens is crap, not because I was in the Himalayas and dropped it into a water pool and ground it into the grass with a tripod leg, but because it got stuck and then broke without impact without abuse.