Jim,
I had seen these on the "net" , but didn't give them to much thought due to the price,and no local feed back......But I was one of the 6 total flats that happened that day....Mine was a rear and it was my first "pinch" flat.....totally cut through the side wall in 2 places....I had to put an internal patch on one side and didnt trust that so I also put in a tube on my fairly new X-lite michlen.....YES I was running TO low of a pressure so the system you are looking at probably wouldn't have helped...the site you linked also states that it is for standard tube type rims.....not sure how it would work on the tubeless rear rim I have?

?
Ralph