The reason why I liked the IP-256 so much is the fact is has a direct mount for the front derailleur (E-Type2). I'll ride the bike with 2x10 (Shimano XT). And also the weight is a really pro.
The only negative thing at the moment is the delivery time. It has a production delay of more than 20 days. I ordered this frame in the beginning of April and I won't send to me before 22th of June.
And I'm a little bit concerned about the removable plate on the bottom bracket (like Carbon_Dude said). See last picture in the topic I mentioned below.
I've placed some pictures of the bike in this topic:
http://chinertown.com/index.php/topic,96.msg778.html#msg778