I haven't had a problem with them and several guys in our group have run them for years - we aren't bouncers yet but hardcore trail riding and crawling comps.
Stauns tubes have a history of not holding up to high speed jumps/impacts. Inner airlocks have not had any problems
we run them on H2's and have destroyed many rims and never replaced a tube, just reused them
I hit a tree and caved in a steel rim and bent the center and the tube and airlock were reused
I just sold my rig and am building new and just called Shawn today to order another set
I tried them in conjunction with outer beadlocks. Popped too many tubes for me and still didn't always hold the inner bead. Too much work. Went to H1's and very happy with them.