I was there today and had a good time! Lots of stuff to see and there was some good racing going on.
Seconded: a fun event. This is the first time that Interbike's demo has been open to the general public. so it presents an awesome opportunity to demo new bikes. I hear from more than one brand rep that demo load was light yesterday, which isn't the best way to encourage these folk to repeat the public demo days next year, so if you're near PVD, swing on down and try some great bikes!
Oh, and the CX racing is good, too.