I think I got 4 yrs out of the Weber cover for my 330. It's a nice cover, I like the velcro tie downs, fit's like a glove.
I've since bought a new Weber cover to replace it. The first one had a mesh screen sewn into the sides to allow air flow. That's where it came apart. The new one doesn't have the screens so I'm hoping it lasts longer.
"I can get a good look at a T-bone by sticking my head up a bull's a$$, but I'd rather take a butcher's word for it". - Tommy Callahan III
XL Big Green Egg, 22.5 Weber OTS, WSJ Gold/Mini WSM, 18" & 22" WSM, UDS "No.8"
Flyers Orange Thermapen
Napkin Killers BBQ