I have covers for them all. I keep my WSM in the garage though it's outside since memorial day weekend. I've been to lazy to bring it back to the garage lol.
All of my grills and smokers are either under cover or inside - always - always......
I like to buy good stuff - even if I buy it used - and then like for it to last and last and last. I figure if I keep my grills and smokers out of the weather when they are not being used, they are more likely to last as close to forever as they can.
My Performer is normally under cover (blocking the driveway in the carport) but I'm being encouraged to move it out in the open. Picked up a cover last week, haven't used it yet but will be using it from now on.