We've been using Smorgasbords on our 29ers - Inbred and an El Mariachi - and they might not be light but they do grip very well. We have heavy, claggy clay round here and they work as well as anything else we've tried.
Not sure if the magazines rate them but I use Bontrager Mud X's, Nobby Nics and some Contis on my 26" Dekerf and can honestly say the Smorgasbords are cracking. Oh, and they're cheap.
Ultimately it depends on your local conditions as I've used tyres that get great reports on forums that I found sh*te.
Got a Chunky Monkey in the shed if you want it.
