I was gonna go for this but read too many bad reviews, I went for the 17 - 70 DC instead.
It seems I may have read reviews on both lenses and not ditinguished the OS one from the other.
However there is a review here
http://www.the-digital-picture.com/Reviews/Sigma-18-125mm-f-3.8-5.6-DC-OS-HSM-Lens-Review.aspx