I have a blackboard glider.
It's good, but from being a novice has taken me 18 months to get to grips with it, but now it really does glide.
I suppose it's down to how long you want to take to learn and how often you get in.
Go and see the black brothers, in hayle at tombstone in st Erth. Take what they say with a pinch of salt, but the glider is a good board.... Says me...but I'm no expert.