Volcano grill lid cover

We just purchased a couple of Volcano grill with the propane attachments for $49 a piece at Camping World. One for us and one for a future gift.

I was wondering if folks that have this grill, purchased and use the cover for making it work like an oven?

It sounds like a good concept but I wonder how they hold up and if it is worthwhile.

By the way, how do you like the Volcano Oven, and what do you mostly use it for?

Thanks, terry