Ive had a couple of fat bikes over the years. Salsa Mukluk and now a full carbon Sonder Vir Fortis which I picked up last year in a Sonder sale. It’s my only MTB, fully rigid running 4.4 JJ’s.
We did a 30 mile loop around Coniston at the weekend, my cycling buddy has a Trek Farley which is another “modern” fatty.
They are just so much fun, they climb and descend well although you still need to pick your line, esp riding in the Lakes.
They always get odd looks from passers by. If you go on the FB facebook pages there are a few bikes up for sale, Kona and Surley will often pop up (a brand new XL Wednesday was recently up for sale). I might get a set of Mastodons for mine this year as a bit of an upgrade for my old body.