I've had Pressure Pros for about 8 years now and have had several blowouts (until I finally wised up and got away from Goodyear tires). In each case the blow out noise was heard before the Pressure Pro started squealing. IE, the pressure loss was sudden, catastrophic. The Pressure Pro, ironically, did warn me of a slow pressure loss when the Pressure Pro unit caused my rubber valve stem to wear against the tire housing and leak; but since it caused the problem, I can't give it credit.
I went to Michelin Ribs and no problems, no more.