When ye decide just for a balance board and provides you similar questions, I recommend you also read my review on the "Balance Board" of "Bad Company Biz" critical reading (do not believe me or anything better member inspects itself).
Otherwise my pioneering already have everything important said (VA T2000 and A.Mlynski describe the board meeting, I think).
I just wanted to give my advice on a possible decision.
Conclusion:
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The "Casall" Balance Board is in my opinion very reasonably priced and reliable. As a training tool in the mid-range heavy exercise for at home Highly Recommended! Who "flatter" looking devices or generally want to distinguish between the offers, especially should the level (Casall: 9cm), the maximum tilt angle (Casall: 27.6 °) bearing surface in the rest position (Casall: approx 2.5cm), and the diameter at base because of the foot / shoe size (Casall: 37cm) attention!