This wasn't my first pump, so I knew what to expect. However this one is battery powered where my other is manual so i was eager to try it. Popped some battery's in and put it on. The hole in the rubber was a bit tight so remember to put a bit of lube on, slipped my penis in and turned it on. The suction from the pump was great and consistent and could see the immediate growth through the clear chamber, I stopped the pump when it got really tight. I left it in place for a bit and switched the pump on a couple of times for a little extra pump.
Definitely some difference in size, mainly girth, so im sure with daily use as recommended you should see some gains to length and girth. Its easy to use and clean, just unscrew the pump of the chamber to wash. The only thing I would change to the product is, I would have the rubber stuck on to the chamber as it does move when pumping and I lost suction, but after another go it was fine. Overall a great product and would recommend.