Following up on Deftone's question about the Tubliss system.
I have 30hr/525mi on them now and I think they are freakin' great.
I have been riding the Sedona 907 tire at 5-6 psi and it performs excellent.
I was at about 7 psi in the front, but I didn't like the squishy feel. Then a wise man said to me 'hey, knucklehead, you don't have to have the front tire pressure super low to reap the benefits of the Tubliss system'. Right, duh. So now I'm at 9-10 psi on a Bstone M59 up front.
The system hasn't given me any problems at all. I use a bicycle floor pump to make sure the red inner bladder is at about 105 psi before each ride, and the tires themselves usually don't lose any air. And I still enjoy the fact that I don't have to carry axle wrenches, tire irons, and a spare tube with me on trail rides.