I'm seriously considering this.  16" deep 4U case racked along with my RME Multiface II and eventually an octet of preamps with Lightpipe all in a 6 space rack.  That'd be sweet for me.  Any of you all made that move?
 
Two reasons I'm considering this are:
 
1.  One less box.
2.  If *stable*, I'd considering performing (gasp!) with Matrix.  It does what I'd need and I don't care to learn another DAW.  Surely somebody out there performs with it.  If you know Sonar it's just too easy and convenient...and honestly, from what I've played with it, it's fun.  So far all my eggs are in the Sonar basket and racking my PC may be the most economical solution.  I really want Sonar to do this.