We got this as an introduction to urethral play, but I would not recommend it for beginners. While the soft silicone is less likely to damage anything, it is very difficult to feed successive beads into the urethra, often requiring more force than you really should be applying (urethral play should allow gravity to do the work, not force). I highly recommend getting a ribbed 5mm silicone sound and learning how to go the whole length before attempting to use this device.
Great idea but not too vibratey..
The quality of the product is great, perfect size for beginner players. The idea of the product is great as well, and it's wonderfully easy to use however the vibrating part doesn't work too well with the sound. I think it's a flaw of using silicone - once pressure is put on the silicone beads, the rest of the sound doesn't vibrate (e.g. if you have it inserted all of the way, the biggest balls have pressure on them so the rest of the length has no vibration).
However, the sensation of pulling out the sound is utterly delicious and on that basis alone I would recommend.