I'm debating the cover for my PG 500 as well, you have to decide if the front shelf is an option you want or not as it determines the cover dimensions and I haven't bought it yet.
I keep having to clean my PG front cabinet with a touch of foaming oven cleaner now and then to get off the condensation trails from low and slow cooks, having the front shelf will make that job a little harder but it sure would be nice to have it's not very expensive to add it.
I see covers by Mel is over in Wakarusa, that's just a little over a half hour away from me I'll look into that option further thanks for the tip!