Has anyone got one/used one yet? I'm very tempted...

I can get a good deal on a new one, but I can't find too many photos/experiences from the new one (not the older version, as it is optically different as well as the addition of OS/IS/VR - whatever you wna t to call it!).

I think I would prefer to buy new over a secondhand Nikon 70-200 VRI (which doesn't cost too much more), due to all the electrics, especially VR,, after a few years use by someone else before I get it.

Reviews on dpreview paint the Sigma as a big step forward (for them) and pretty close to Canikon equivalents.

What do you think... Stick with a second hand Nikon, I'm paranoid for no reason, the Nikon is well known to be an excellent lens? OR try the sigma?