I have one and am currently using it for everything and it is great for some things and less so at others. Good fun on jumpy stuff, relearning how to land a bike without suspension. Great on familiar local trails, especially in gloop and just different in a good way.
Limitations for me are fast rocky descents, I blew the back tyre off the rim in the peaks recently, so definitely need to get them tubeless.
I was running lightweight tubes to keep the weight down and they just aren’t up to the job.
A tubeless fat bike with a suspension fork would be very capable downhill, but I bought mine mainly for softer conditions and to save wear and tear on my full suss, so will most likely stay rigid.