I use this site (lurking) a lot, and I respect the reviews.

Sigma has a couple of new lenses, but as of the moment only the old "discontinued" versions are reviewed on this site. Arguably, whether good or bad, these two new ones are some of the most curiosity-inspiring 3rd party lenses out there now.

The new Sigma 70-200 2.8 with stabilization has a focal range & characteristics which are in extreme demand, with no quality alternatives to Canon users other than Canon. (per the tepid reviews here and also the mixed reviews elsewhere).

The new Sigma 120-300 2.8 with stabilization is essentially a unique lens (per the review of the old model on this site) and the old version also recieved tepid reviews on this site.

I am seriously looking at a Canon 70-200 2.8 IS II, which has recieved a glowing review here) but I would love to know, one way or the other, if an acceptable cheaper alternative exists. And if the new 120-300 were good, it would be tempting for sure.