PLEASE DO NOT USE WITH RUBBER STEMS! it isn't worth the risk...i had 90 degree aluminum stems on one set of rims but forget to put the other ones on when i changed rubber on my other set...i noticed that the rubber stem was bending a little but had a stupid moment and didn't really pay attention...just a couple curves after leaving the CROT after a trip through the Dragon, i ended up on the side of the road with a cut stem...i am very thankful that it ended up with just waiting for lavinrac to come get me instead of it being much worse!
the system works great...as soon as i felt something weird, i looked down and saw the low pressure alarm blinking which confirmed my suspicions and enabled me to get to the side of the road before losing all the air from the tire without any issues...this was the second time it has saved me since i put them on a year ago