Got it yesterday from a fellow forum member "StaticThought"
It's not bad, rather nice lens. None of my zooms are f/2.8 and I wanted something until I can afford the Canon 17-55 f/2.8 IS, so this fitted the gap.
So far so good.
It has the normal (for me anyway) problem of the odd miss focus but I'm now starting to think it's my 350D as I have found the better focus system in the 30/40D make most Sigmas focus better from the tests I have done (40D sometime before Xmas for me then)
f2.8 is a bit soft, not found the point it start to get sharp yet.
Couple images from todays first outing with it both are still 400 ISO but the sun was going down. But no way would I have got them with my 17-40 L (my normal walk around lens) it was just getting too dark for hand held.