Welcome

Unfortunately I'm not. It was my local centre for two years and I find it pretty poor. My local trails are Glentress and Innerleithen, the Tress has become a victim of it's own success and is too commercial but the trails are still quite good. The XC route at Inners is great although the climb up from the carpark with a hangover is a bit rough. Of the Welsh centres it's Penmachno that does it for me, Betys is a bit like the Tress, the Marin is ok but a bit too easy. Get yourself up here and I'll take you round the trail centres and we can rip it up.

I'm not a single speeder, I have friends ;-)

I'm just a bit surprised you found it so poor. Lots of people enjoy the center and find the trails quite demanding. Depends on who you are and your fitness levels I suppose. But aye maybe they should visit other ones aswell instead of visiting the same one.
I'm only half a single speeder myself. I ride a gear road bike with a cycle club. Happy riding my friend.