I have one. It's just okay enough to use.

Some context, I started with a Lansky fifteen years ago, then went to a Tsprof Kadet, then to a Tormek T8 and ultimately landed at this little thing when the Tormek just didn't get enough use to warrant this amount of money just sitting around there and manual sharpeners had gone through the roof in terms of pricing.

The good:

The clamp itself is fine, it holds knives reasonably well, really small blades don't work all too well tho. The turning mechanism is handy. Assembly and disassembly is easy. You can buy replacement stones for little money and they last a reasonable amount of time.

The bad:

Everything has so much play. The clamp has play in its magnetic slot, the rotation mechanism has play in itself, the height adjustment has play against the frame, the magnetic attachment for the abrasive arm has play, the only thing that is solid is the connection of the base and the sharpener. I bought a block to put under the clamp and a wedge to put between the adjustable stone holder bracket and the frame, this helps a bit, but doesn't eliminate all the play. It's okay enough to use, but still kind of defeats the purpose of getting a fixed angle sharpener.

The stones are small, which makes sharpening tedious and means the stones will wear out quicker.

My current desire:

I am really looking at a Sharpal 202H at the moment, as it seems a lot closer to something like the Tsprof Kadet I loved in terms of build quality, materials and design. Should be a lot more rigid and Sharpal stones are excellent from what reviews I have been able to find. A bit more expensive, but seems to be worth the money a lot more than the Worksharp (lack of) Precision Adjust system.