If I had them, I'd retain them, and be sure I had instructions and tools to support tiring changing while traveling.
I do believe the add a degree of extra safety.
But I have not bought them. Considered it, and decided that maintain good quality tires, properly aired, and with a TPMS - was reasonable enough preventative measures. The one area that I would not be covered with, that they would aid in, is in a catastrophic blowout tire failure. I'm betting, and yep it is a bet, that that would only happen if I hit some road debris. And I do the best I can to know what our tires are rolling over, if I can not avoid debris, I get prepared as anyone can for a sudden blowout.
I myself, and have my wife too, review the Michelin Blow Out video yearly. It is so instinctive to back off of the gas pedal, that we both occasional remind ourselves of 'What do you do in case of a blowout?' - accelerate until you get control...
If funds were unlimited, I'd consider them, as they do add extra safety.
A decision that each must make.
Roo II is our 04 Country Coach Allure 40'
OnDRoad for The JRNY! Enjoy life...