I have a single treadle Babe Fiber Starter. That's what I used to learn to spin on. It's really a decent little wheel. Its only flaw is that the base needs to be weighted down a bit because when you start spinning, the whole wheel has a tendancy to tilt forward. I used a couple little 5 pound dumbbells and that fixed the problem. But I always thought I could probably fill the base pvc with sand too... I just never got around to it.
In my opinion, it's a great wheel to learn on. No sense in spending $500 on a wooden wheel if you don't even know if you'll enjoy spinning!