I have had my DP-4000 for almost a month now. I bought it w/o hesitation as this is my 3rd pump in the Deep Throat Maximizer series (all still work perfectly). The Maximizer line is famous in the PE world for its unique Suck/Release cycle. The new Maximizer provides the ultimate expression of the Suck/Release mode of operation by letting the user create custom pump profiles of vacuum level over time. Pump profiles can be saved, traded, enhanced, and even mixed in a playlist (this is a feature that we'll have to wait for) or even download directly to the digi-pump for occasions when you have to pack extra light. Apart from the full authority, precision digital control, the small size of the digi-pump is its next most revolutionary feature. It is very compact. Even better the digi-pump is active only when it ratchets the vacuum up so that it's also very energy efficient. This can be important when operating portably (on a battery): boat/car/camping scenarios. The digi-pump is also extremely quiet, emitting a muffled stepping sound pumping up and when pressure is being backed off a series of precise sounding clicks. This system is all about digital precision control and is almost guaranteed to be a control freak's (like me) delight. The ability to upgrade the software, both at the pump itself and on the PC means that even more tantalizing features can be made available. The DP-4000 is a quantum leap in penis pumping, sizing and conditioning technology. Suck/Release has really worked for me and I'm very pleased with my new DP-4000 digi-pump. My sincere thanks to Chris and CTC Company for making it available to the PE world.

Bawcock