Thanks.

Just to update. I am now doing most of my trail work, 365 days a year, on the fat bikes. With some experience, you can adapt your technique to somewhat compensate for fat bike shortcomings on the real techie stuff, i.e., quick turning and rapid climbs, to name two. They'll still never be as agile and quick as a regular MTB trail bike, if that's your thing, but they will let you deal with some trails and conditions that are all but impossible on any other type of bike. When I do switch to a standard MTB, I miss that wonderful stability of the fat bike, immediately. Seems like I have to be all the more alert with the standard MTBs. Riding a fattie gives me more of a chance to relax and enjoy the scenery.