I've had mine on a couple weeks and its a love/hate relationship. I think they are too cool in that theres an app for my iPhone and I can see what my tire pressures are. I don't like the app itself in that you can't adjust the max/min pressure settings except within a few psi's. What this means is I have my recommended tire pressure set for factory specs at 36 psi for the front tire and 40 psi for the rear. The max pressure the app shows is about 46.5 psi. What happens is when the tire gets warm from riding, the pressure will climb well above that setting and then I get the alarm telling me my pressures are too high. You can adjust the max pressure up to about 49.5 psi but any more than that and the recommended pressure starts increasing, which causes the minimum pressure to increase. I am more concerned with the minimum pressure than the max pressure but I would like to be able to control both without affecting the recommended pressure.
The other issue I have with this system is the use of my iPhone. I thought it was a cool idea at first but I don't keep my phone mounted anywhere except in my pocket and if I receive a low pressure alarm while riding, I won't notice it. To me, its a waste of money as there are other systems with dedicated displays that can be mounted somewhere on the fairing. If there were a way to monitor and set an alarm in my Boom Box, that would be ideal but until Harley comes up with a TPMS, that will probably not happen.
I also looked in to returning it, but they have a 20% restocking fee and it has to be shipped to Malaysia and the shipping charges would eat up any potential savings from sending it back.
I have written the engineers requesting next time they update the app, if they could make it possible to adjust the min/max pressures independent of the recommended pressure. We'll see........
As for reliability, I havn't had it on long enough to make any calls. I do know that if you decided to reset the recommended pressures, you have to remove the sensors, wait 8 seconds, and then re-install. Its a somewhat pita....
Hope this helps anyone considering purchasing this system. Overall, it has some good features. If I had it to do over again, I probably would opt for a TPMS with a dedicated display. Just my 2 cents worth...