Will, that was an interesting read and confirms some of what I've found also. I used beer one time, didn't taste anything special, and switched to boiling water in my Weber chicken roasters after that. I tried adding herbs and don't bother with that either. I like that I can fit 2 birds on my grill, maybe even three, but I'd have to move them around during the cook.
As the N.W. mentioned when writing about the Weber roaster, quote: "the beer got hot fast, and boiled away rather quickly." Well, it had to go somewhere. Maybe up into the chicken?
Mostly, I use the Weber roaster because the skin does get crisper all around (including the back) than some other methods I've tried on the grill, and I like that it makes carving the bird so easy. And it catches the juices, which I enhance a bit and pass at the table.
Rita