I think you are asking two questions. First, should you cover your grill? My answer is absolutely unless you intend to roll it in and out of a covered storage area after every use. Second question is, if you are buying a cover, should be get a Weber OEM cover? From a fit standpoint, unless you are lucky or get one custom made, obviously, a Weber OEM cover is the best choice. Opinions differ on how well they hold up. I think a lot depends on where you are located and how much they are directly in the weather. Direct sun seems to be especially hard on them. I have Weber covers for all my grills except my Performer. Several of them are over 10 years old. I like them a lot and am thinking seriously about replacing the one I have for my performer with a Weber cover because I don't like they way it fits. I think the main reasons mine have held up so well is the Georgia climate and the fact that I have them sitting on a covered slab that used to house an RV by the previous owner.