I have a brand new Napoleon Prestige and got the Napoleon cover. The first day it got rained on, the grill has pools of water sitting on the side shelfs. I say this sarcastically, but it looks as if the cover didn't even try to stop any of the rain.
I've seen fantastic reviews for the Coverstore products, and am willing to go with an Ultima or Prestige, should they prevent water from seeping through the cover and hitting the grill.
Any thoughts and feedback would be fantastic.
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1-YR Update:
I ended up with a Coverstore Prestige cover in black, for my Napoleon Prestige 500 Phantom grill. it's held up tremendously well. So much that I had a custom tan/khaki cover made for our outdoor patio furniture set, and another for our Ooni pizza oven cart. No water gets through either cover, and after a year of use, there is ZERO fading or staining, on either cover. The buckles and sinchs hold onto the grill and furniture very well, even through 30-40mph windstorms that rip through our area.