Got one of these 4 months ago. Works perfectly well, as long as you only put a laptop + mouse + mousepad on it. Put the weight (e.g. the laptop) on the support side.

Make sure what you put on it does not slip easily, e.g. by putting an anti-slip rubber on it - when it is extended to maximum height, a small bump in the leg area could send stuff gliding otherwise.

Also, the wheel locks are far from perfect. Doesn't bother me much, but don't expect the table to be still.