Anybody actually got one of these and care to give me an opinion on it? This is the OS version released last year and not the non-OS version. I'm looking for a fast 2.8 zoom above 200mm for use in sports photography. I need a zoom rather than a prime at this stage. I've done the google thing and can't find much on this particular lens. Lots on the non-OS version, but I'm a bit suspicious of Sigma's QC/QA processes and the lens has been extensively redesigned from what I can tell. I don't want to fork-out over $3,000 only to find that it's a dud.

TIA

Snoopy