Not a prototype. Not sure about reviews...? I can't say anything bad about it. Very laterally stiff. The PUSH'd Rocco is amazing too!

They made this design for 2 years 06 and 07. They have a newer version now, but the geometry is nearly the same. They also purchased Karpiel not too long ago.

Check duncon.com
and
www.pinkbike.com/news/Duncon-Frames-North-America.html

 Looks sweet. Can't find much info on this frame. Is it a prototype? or are there any reviews on it?