As a veteran of the Stahly pass-around that recently completed, I can tell you that if you can get it for under $30, you should buy it just for the head alone. The Stahly head is engineered in a unique way, and produces a marvelous shave. I found that it likes to be paired with sharp, aggressive blades like Feather and Astra, but it produces a pretty mild, irritation free shave. You can fit the Stahly head on other handles ... I use mine on a cooncatbob Bull Mastiff.
The vibrating handle is a cute novelty, but really doesn't add much to the shave. The handle is relatively lightweight compared to the mass. Each windup of the handle will give enough vibration for one pass, and even though its still got some energy left in the spring, you need to re-wind it to get the full effect.
I Came. I Shaved. I Conquered.