The PicoBong Kiki is brilliant in that it's small; comfortable to hold, direct, easy to use and that it's exceptionally quiet. I wouldn't hesitate to use this vibrator with someone in the next room, which makes it perfect for people with roommates. I consider myself a relatively intelligent woman but I have to say, it confounded me for a few minutes when I initially looked at it. I had read the instruction manual that came with it and saw the + and - symbols mentioned to control the vibrations and rhythms, but I'll be damned if I could find the + and - symbols. Talk about a humbling experience. It's the size of a tampon and I couldn't locate two little symbols on it. I finally found them situated within the "P" and "B" of PicoBong on the side. I experimented with them to go through the selection of vibration strengths and rhythms but, to be honest, I found it difficult to get to the vibration rhythms. You're supposed to hold the + button and get to the highest steady rhythm then hold the same button for 2 second intervals to move to the rhythms, but every time it felt like I'd gotten to the highest steady rhythm, I'd hold the button and nothing would happen. I still don't know exactly how to predict that. I need to explore more with it. After some fiddling, I did manage to get it to move onto the rhythms and they were interesting, though I found myself preferring the steady vibration rather than the rhythms. Also, as you hold it nestled in your palm down there in your nether regions, there's no easy way to see or feel the buttons because they're under the silicone shell and flush with the surface. I think if they had made the buttons stick up a bit, it would be much easier to locate and utilize them blindly with the pad of a thumb. Thank god the silicone gives it some grip because muddling around blindly with your thumb trying to locate invisible buttons on a wet toy could easily have lead to some irritation when it went flying and you had to retrieve it.