Got my retail copy for £35 (friendly reseller).
Just had a quick blast, so here's my review from 30mins gameplay:
Visually it's spot on, sound seemed really good, especially engines (although I only got to hear a couple). Racing AI seems pretty good - not easy, not stupidly difficult. Very PGR-like racing, good mix of arcade fun and real feel for the cars and tracks.
The penalties are good - they don't do you for every little nick against the other drivers, or every touch of the dirt, but it you cause a big smash or use a major shortcut then you'll get hit with a penalty.
Importantly (for me at least) the load times are very good, not even close to the GT load times.
Presentation seems good. Most importantly it was *fun*... working later tonight, but have probably 4 or 5hrs of enjoying it before then (and all day off tomorrow in exchange for working tonight - couldnt of worked out better).