I use one all the time both at home and on the road. I have a large Weber grill at home that works great and I use a Weber 100 or 200 when traveling. You can cut to fit with a pair of scissors My grill mats are rated for 500 degrees. When grilling burgers, steaks, etc with the grill mat you still get the grill lines. In fact, when I do pancakes with the mat, my pancakes will have grill lines. The part I like is the easy clean-up, after grilling before cooling down just wipe clean with a paper towel. I have one mat that I have used over and over many times. The only problem I have ever had is on my Weber 100 the mat covered the entire grill surface and smothered the fire. After trimming, it worked great. The mats I have are guaranteed 5 years, whatever that means.
You'll never know until you try one...
John