After 10 years with a small, cheap gas grill (and nine years of pestering from my wife), we finally upgraded to a nice Brinkmann four-burner, so of course protecting it was a no-brainer. This cover (we got the 60") is heavy duty, fits like it was tailor-made, and looks great. I like the Velcro tabs that snug up the cover on the sides. (I can imagine my cats taking shelter under it from the rain.)
Good stuff, great price. "That is all."
Update 7/12/11: I've had this cover for a little over a month and a half. It gets about 4 hours of direct sunlight every day, and the very top of the cover has faded to a dark gray. This is not a huge issue for me, but if you're concerned about how it's going to look long-term, it might be for you. Obviously if your grill is in a shaded area, the color will last longer. Just something to think about.