Very nice with smooth vibrations; won't knock your socks off but the tingly can get pretty powerful on the highest setting. Personally I love how easy it is to adjust the strength of the vibrations - just twist the bottom cap smoothly. The vibe itself is also waterproof and very quiet, which is a nice plus!
It is bigger than it appears in the photo; at its widest point it's an inch and a half, maybe closer to two inches in diameter. I bought it as a starting toy but wouldn't recommend it for beginners unless you know you can accommodate it.
The jelly rubber material it's made out of can be a bit sticky when dry, so be sure to use lubricant, but otherwise it glides in very nicely. The shape is ideal for stimulating the G-spot (really, VERY ideal for it) but not really for pumping in and out. I've learned to use it after using something else to stimulate me for a while, or else it just won't go in (or else is painful upon entry); it's definitely something I use as a supplement, rather than as my main toy, though it's one hell of a supplement.
Overall very satisfied with it (once I learned how to use it)! I've had it for a few months now and use it fairly frequently, and it hasn't weakened at all.