The FB is a good option out of the current offerings.
It is lightweight (tubeless makes a nice, noticeable improvement too), has decent parts (CF fork, GC tyres), and is specialized, which means a well sorted overall bike. Price is good too
It rides well, the GC tyres perform superbly, and you get the back-up which from Spesh (I have always found) is faultless
However, you may have problems finding one now – Place I bought mone from aren’t getting more till Feb
But, all that’s just my opinion, and Fat Bikes maybe crap and no fun after all