When I received the Slubb my expectations weren’t exceptionally high. I haven’t really found mini male masturbator’s to be very effective. But I will say that I was pleasantly surprised when I did try the Slubb. With an adjustable belt and variable speed control, the Slubb delivers an exceptionally high level of vibration. It was definitely more intense than I expected it to be. I found the number one and number two settings to be ample vibration. It is a bit heavy, and I would have concerns for the safety of using it at its higher end. All in all, I would recommend the slab because it does get the job done.