Nickel 650b conversion, yes we can!
Built a 650b rocket with this frame, total build with nice components and 1x10 drivetrain is a touch over 26# and could easily be in the 25's with $250 worth of lighter components.
Geometry makes for a very engaging and fun ride on moderate to technical trails, feels very light on its toes and I'm running a 140mm front fork.
The bike is a bargain at anything under $1k for the frame, at the $699 price and with as much buzz as these are getting online in bike forums they will be gone soon.
A well executed single pivot design works well, awesome bike, buy it.