I have the TST flow through system on my dually and the 5er. Yes it's a pain to add air because it's slow going. I don't need the repeater for my set up. I had a sensor stop working while out west last summer. I emailed TST and they sent me a new sensor when I got home. I sent the defective one back to them. I did find out last winter that you shouldn't use chrome valve caps on them as the two different metals of the cap and the stem of the sensor will react with each other and they will be very, very hard to remove. I took them off for the winter this year.