Very happy with the Electropebble. I like the control knobs intead of push bottons up/down. Gives you much greater ability to adjust the power and frequency just the way you want it. I also like the different programmed frequencies. My favorite is Torment! For the price and compared to others on the internet, this one seems to be a very good deal. My only negative comment? I wish the battery compartment was just a little bigger. It can be a real challenge getting the 9v battery in and out.