I was very pleased to have a courtesy checkup with these guys, and it was even better that they didn't charge me for it! The issue that I had noticed was unfortunately not reproduced (some googling indicates that the problem is fairly mysterious in general), but they assured me that the fundamentals of the system are working well. Why 4 stars instead of 5? The tire inspection only looked at the amount of tread, and completely missed extensive dry rot in my tires. Still, the owner was nice enough to come out with me and visually confirm what it was and that it likely was a problem!