I have had two pairs, and they have performed well. The old style need to have lock tite on the threads so the round nuts at the front of the barrels do not come loose, The newer style do have to be tightened occasionally. I have been skiing at Taos for over 300 days with the combination of the two bindings on pretty big skiis. Mostly bumps, powder, and steep shutes,ie; (in area).
I have not had a failure of the bindings and really like the way they pull from under the sole of your boot rather than the side.
I could see increased stress on the heel piece if you tend to bend your rear boot to 90 degrees.
All-in-all, they have worked really well.