I had a look at one of these after I'd sold my 17-85 & bought a 24-105 to extend the wide end in my kit bag. You need to get to a shop to have a play because its a very heavy bit of glass and the front element sticks out miles.
In the end I went for the Canon 10-22 - the difference between 12 mm & 10 mm is significant and at the widest setting this lens is ludicrous fun. A couple of the guys in my camera club have the sigma 10-20 and enthuse about it - I think the Canon has a slight edge but then its quite a bit more expensive
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