I owned a set once, they are great little tires. Mine were like new and had a boatload of tread, so they dug like rototillers. I wound up selling them for $250 (for all 5 on rims) and bought a set of 5 new siped 32x9.5 Swampers and love them. Nothing at all wrong with the 29's, a lot of guys on the Zuki board are running them and really like them. IMHO, nothing beats a Swamper (for the New England Wheeling anyway). Give Zukinut a shout, he bought them from me, and ask over there because I know a few others running them.
For $100, you can't go wrong. I had mine on a set of 5.5" wide Zuki rims, but the bolt pattern is wrong for an XJ.
Here is a pic of the 29's, 32's, and 33's in a row.
Waldoboro, Maine (yes, we're BACK!)
'81 CJ-8 Scrambled, It's a Jeep, Chevy, IHC kinda thing!
'88.5 Slamurai, 7" Lift, Locked, Swamped, Rolled, and just generally broken in right!