recommendations on tire pressure monitors

Hi Harvey51 - all 3 times were punctures while moving. Driving on the interstate, dash monitor starts beeping red LED lights up, check display - it flashes the pressure and temperature of the problem tire. Had I simply checked it that morning, it would have been at full pressure. With the rate of air loss if I had kept driving it could have been real expensive (new tire, maybe rim, maybe blow-out). 3rd time we were on a gravel forest service road, no cell service. Apparently went over sharp rock just right (or wrong...). Managed to get rig to a wide spot that was fairly level so I could change out that tire. Without monitor would have simply continued up this narrow road... Recalled a 4th incident, too. In the Blue Ridge Mountains, just as I noticed I had elevated temps in a front wheel, realized I had spongy brakes. Apparently caliper had stuck, heated the rim enough to raise tire temperature. Wasn't hot enough to cause system to alarm, but if I had been more observant of the display I might have noticed it climbing even quicker, maybe before brakes faded. Either way, I knew which wheel was the issue. Let it cool, proceeded carefully. Nice thing is no horror stories to share! Certainly happy to have it on the toad now - no issues there so far - couldn't imagine dragging my Suby with a flat for hundreds of miles... that would be generally bad...!!! ST