I have gone through lots of covers. My Weber BBQ is 22 years old. My latest cover is a genuine Weber (took awhile to find one for my ancient grill). The previous one lasted from 12/31/2006 to 8/28/2012 (I just looked at the invoices). The five-year-old cover is still looking great.
By contrast, the
Masterbuilt cover (i.e., one manufactured and sold by
Masterbuilt) for my MES lasted less than twelve months and then totally disintegrated. It is total, complete junk. Stay away. To replace that, I got my kids to buy me a really high-quality cover from Classic Accessories:
Masterbuilt MES 30 Cover
I got it for Xmas last year, and it has faded considerably at the top, but the material is in fine shape.
You can research their site to see if they have something you'd like for your BBQ. Here is one that claims to fit, but I don't know what Weber models would be compatible:
Veranda Grill Cover fits the Weber Genesis
I wish Brown Jordan, who makes outdoor furniture, would also make covers. My late parents gave us patio furniture made by Brown Jordan. This was back when we put in our deck in 1988. That furniture has been outside, 24/7, since 1988 (30+ years) and still looks great. Nothing has cracked, torn, chipped, or gone bad. Absolutely amazing!