A great toy that can induce big loads. The important thing to remember here is to use a good lube. The rubber sleeve will tear after a while, and once that happens, its all downhill from there. Do NOT use oil based lube, as that will degrade the sleeve. The plastic cup has needlessly sharp edges; rounding it off would not be difficult, I dont know why they dont do that at the factory, so be careful putting it together.
When assembling it leave a good amount of the sleeve to curl up inside the cup; this gives a more realistic ******* simulation and gives lots of fun sensations.
All this aside, it does **** the head of your **** very well, and gives some great stimulation. I have had some serious ******* with this thing.