In reply to blackmountainbiker:
I've been about 4 times, always for uplift I've ridden most of the blacks, all the reds, and the blues. it's like a mini alps experience (with worse weather) and great prep.
The Blacks are good, but I don't fly down them, the reds are my bread and butter, but the blues there are indeed lovely, especially the long new one (with the rest area lol!) and great fun to thrash down quickly. This is riding my "enduro" bike
I love riding cross country, and will often go on to do the Gorlech or the Raven at Brechfa they have beautiful interesting climbs (as well as some cracking descents)
The place is designed for uplift. If I were local I'd pedal up, but probably only once as part of a loop each ride.
What ever you do don't buy second hand minibuses from them