I’ve got 2 XLC posts: 1 on my hardtail and 1 on my gravel bike. I’ve had 1 on the hardtail for 3 years now. I like them. They take the sting out of trails and rough ground in those times when you’re not out the saddle in the attack position, bombing downhill.
They take a bit of fiddling around to set the preload correctly or get the right spring for your bodyweight.
For £30ish, they are worth a try if you’re curious about them. When I upgrade my rigid bikes, I’ll upgrade the suspension posts to Redshift and PNW’s suspension dropper.