Yeah, I'm using them. Well, I've got one on the front and a Purgatory on the back.
I got them because they're one of the only decent tyres you can get for £20 easily and they'll go up tubeless. On that note, I'm planning to keep using them because they're much easier to inflate than the High Rollers I used to use.
Compared to High Rollers, they're not QUITE as grippy, but pretty close. The sidewalls are thinner (I kept pinch-flatting (tubeless!) on my Prophet, but have no problems at the lower speeds I reach on my hardtail) – but they weigh less. They're nice and big and they've lasted well too.
Overall, I'm a fan. I'd rather use High Rollers or Minions, but these are a bit lighter (which is what I wanted for my hardtail) and I find them better for tubeless. Nice tyres.