I have a Weber one that I picked up during Target's seasonal clearance last year. I used it a few times for ribs on my 26er. It worked as advertised, but as was noted above, it is a complete bastard to clean. Even when its "clean", I don't feel that I actually got it clean. It is one of the reversable ones that doubles as a roast holder. That aspect of it works awesome. I use it all the time for hams, turkeys, chickens, and the occational roast. I wouldn't buy one at full price, but I think I only payed like $6 for mine. For that price, it was worth it.
This is a 13lb ham I did for Christmas day. I like the way the rack gives just enough clearance for a drip pan to slide under it on the same grate.