|Handles sand okay.|
It Is Not A Fat Bike:
While three inch wide tires can do a lot, they don't have quite the float of 3.8"ers or wider. Sand traps, while eminently more "doable" than on a 29"er, are still a chore on 29+ tires, while your fat bike would simply laugh and roll on. Still, your traction and roll over are tremendous with 29+. Definitely a "plus" over any 29"er set up and better in many ways than a fat bike set up.
You also have a lighter weight than a full on fat bike set up, and less rolling resistance with a better turn in than fat bikes have. If you can live without the flotation factor, this set up really rules.
Higher Bottom Bracket: Probably the biggest negative here is the higher bottom bracket, which makes dismounting and mounting a chore. If your fat bike has a dropper post, or can take one, get one if you go 29+. It will definitely enhance the ability to get going again off road, not to mention getting down steep stuff will be easier. I'd say the 29+ set up on the Ti Muk sent the BB height up at least by an inch, although I haven't actually measured the difference.
So far I am really liking this set up. Of course, when Winter comes in, I will be swapping out wheels to fat bike wheels and tires again. The plan is to swap wheels with the boy's bike which has Rolling Darryls and to not use a front brake in Winter, since the fork and hub are not compatible. Until then, this bike will be getting the call a lot in the coming months for more adventures and for just cruising around.