I didn't realize we had a discussion on the Kissan one already:I don't like this one how do you read the display if its on your key chain?
I like this one I may even replace my smart tire system with this one.
http://www.kisantech.com/popup/multiimage.php?product=TPM-30
No experience with Kisan, stuff. They always seemed overpriced compared to the alternatives IMO. I'm very Happy with my SmarTire system but I did have a display that started to fail. Some of the segments that formed the numerals conked out making it impossible to read. To their credit, SmarTire quickly sent a replacement and so far it's been solid since.I had so much trouble with the Kisan Charge-Guard unit (went through multiple shunts, temp sensors, and control modules (everything but the display failed more than once), that I'm done with Kisan. My Smarttire monitor worked flawlessly on the ST1100.