We have a set of 6 TST 507 Flow-Through sensors and wouldn't do without them. They work great, wireless monitor is perfect, and their customer service is outstanding. I had an issue with one sensor last year and they talked me through the fix on the first call. I feel such a sense of comfort knowing the status of each tire as we travel. As soon as my new Legacy comes in I will install them before leaving the dealership!
2016 Legacy SR340 KP (340HP, 2500 Allison)
Toad: 2013 Wrangler Unlimited