We bought a TST system (before the flow-through sensors were available) 2 years ago after our first trailer (bought used, 10 year old tires) had a blow-out which I wasn't aware of until passing cars let us know! Luckily the blowout caused none of the possible catastrophic problems it could have. I bought sensors for my truck tires, too, and appreciate being able to accurately monitor them, especially since we are right at the limit on the backs at 80 PSI with the heavy pin weight of the Solitude. I would rather have the flow-through sensors, but it's really not much trouble to unscrew my existing sensors when I need to remove or add air. When we are going to be in a place for more than a day or two, I like to take the truck rears down from 80 to 45 PSI so it rides better and doesn't wear out the center of the tires, and then pump them back up before attaching the trailer. I really appreciate the security of the system and have never regretted the purchase. I have also found no need for a repeater. I did have a rubber valve stem crack and found there are "standard" and "heavy-duty" rubber stems with the heavy-duty ones having some sort of metal liner inside. The one that cracked was a standard one that should never have been installed when I got new tires on the truck. I haven't had any problems since then, but I will be installing all metal screw-together stems, like on the Solitude, on the truck next time I change tires. The weight of sensor on the end of the standard sensor was probably the cause of the cracking. I was very lucky that my wife heard the air leaking when we stopped for shopping, as the stem totally broke when the mechanic wiggled it!