BRC-MacKenzie--I have two sets of inserts on my registry. Have you found that the mesh on the inside of the cover gets wet from pee and therefore doesn't dry as quickly/ can't be used as many times as a regular diaper cover could? Does it retain smell more than other covers? I think I read those comments somewhere and it made me hesitant.
I have a couple of the old version of them, but they're similar enough. I did find that using the Grovias with their inserts really meant that I could not count on reusing the cover. Since newbies poop pretty much every diaper and the inserts are narrower than the cover, there almost always was something on them. Since you can't wipe them out due to the mesh, there's a lot more dirties. With a fitted or fastened prefold, though, I'd think it'd be pretty much like any other cover.