They’re a Maxxis carcass and compounds, so you they setup tubeless pretty easily and the rubber compound is good.
Ran a Smorgasbord for a while and didn’t get on with it myself though. On the front I found it washed out too readily on any terrain, on the rear I found it ideal for rocky and hard packed terrain, but less so for more softer “natural” trails if you will. As a rear tyre for attacking trail centres and places like the Peaks I’d definitely recommend one. For me I just found it too loose in other conditions to recommend at all.
Highly personal subject though tyres! One thing I can say about the Smorgasbord was that for a BIG 2.25″ tyre with a chunky tread that it rolled well. Wasn’t even that heavy for what it is either. Oh and they’re quite tall, as in they’re taller than they are wide if that makes sense… Best suited to a wide rim, I ran on Mavic 521’s and I’d recommend wider still personally.