I've had the opportunity to try it twice.
I didn't fancy it to be totally honest. The phallic attachment rotates in a circle and or back and forth. It didn't get me off, and didn't really feel that great IMO. The "seat" that you straddle vibrates, and even for this clit of steel it was too much. The vibration just made me feel numb all over my whole vulva, my thighs, etc.
With the vibration setting turned down lower, it didn't' get much better.