Snubbyfan:

The major advantage of those grilling mats is not having to clean your grill surfaces anymore. You just take the used grill mats (after they've cooled down) and soak in a sink full of hot soapy water. Then you give them a quick rinse with clean water and towel them off for the next use. The one thing you really need to check is that they don't cover the entire cooking surface (the mats are easily trimmed using scissors).

Good luck,

Dave