I've got an older Mukluk, bought it off this forum a few years back. Dang thing cost me an arm & a leg, and it was worth it.
It has a nice, stable geometry for plowing through everything off-trail, riding skinnies, slime, ice, etc. It is a wheelie machine.
Vitt put down some good reasoning info; and don't think you'd regret a Muk one bit, or any fattie. The newer Muks with those Alternator dropouts are enticing -- supposedly you can slide 'em back for long, stable trash-riding, or slide 'em forward for shorter wheelbase manuevers on tight twisty singletrack.
Built a 9zero7 this winter, because at the time you could not put a Rohloff on a 170mm bike (Mukluk). Now you can dammit.