I've had the official board before, so I am in a position to compare this product to the real thing.
Syncing was straightforward, but if you have problems try fresh batteries. I like the additional touch of the lighted corners when you step on the board. I hope this doesn't provide an additional drain on the batteries though.
The board seems solid and well-made, and just as sturdy as the official product. My weight and centre of gravity seem pretty accurate. I actually prefer the surface of this to the original board as it's more textured and provides better grip.
On the underside of the product, the feet and moulding seem similar to the original so I imagine that the usual accessories will fit.
Update: I tried it with a riser designed to raise the board for step aerobics. It fitted perfectly so it seems that accessories designed for the official board will also work with this one.