used them for years. I find them great grilling veggies, kabobs etc. Or burgers, even meat stays jucy, but doesn't get the grill mark and crust. So usually the meat goes on the grate, other stuff on the mat. Nice thing about the mat is it only takes about 30 seconds to wipe clean after using it. and unlike foil, stuff doesn't stick. even with pam, I occasionally have things stick.
had many friends and campers see me using them and the results and they went to amazon to get a set. Nobody I know has been disapointed, all are glad they started using them and wish they had found them years ago.