I don't have them but have thought about getting a set. A lot of people swear by them. Pressure Pro seems to be the brand of choice for most folks but I haven't heard any operational complaints about any of the brands.
I always figured that I'd know when I had a flat but after reading here and on other forums about people getting flats and not knowing till either they stopped, saw it in the mirrors or someone flagged them down. Makes me think about it even more. I keep my tires checked but you never know when something might happen. Sorry I don't have more than these few musings about your questions
Salem 29RKSS Pushing a 2500 Mega-Cab CTD!
Gotta go campin!