The DP-4000 was bought after reading the reviews on the internet. Before this I was using the XL-2000. I totally agree on all the reviews, I am using the DP-4000 with the software running on my netbook. This gives you ultimate freedom around the house. I recommend this pump to everyone, it even came with the right adapter for my country. (NL)...

I have used the DP-4000 and have found it to be technologically far above non computerized pumps. It allows for diverse protocols only limited by your imagination. I have found spiking, for example, is a process of jumping to a substantially higher vacuum briefly , very constructive in optimizing the enlargement process. This pump can perform any patterns of spiking desired and to my amazement keeps the counterproductive edema minimal , which is great news! This great pump can be coupled with the Stallion Cock Cushion which increases the penile internal pressure thus holding the penis in a pumped or semi pumped state facilitating tissue acclimation to a larger size more quickly and effectively . I have recommended this combination to many students/clients. Dr. Richard R. Howard II...

I have been a pumper for several years, using a traditional pump. After purchasing the Digi-pump, my time pumping has been cut in half, my bulge is huge. It's a great product! The power source recently failed, however, and I am patiently waiting for its replacement. I'm hooked!...

CTC's chambers are the best I've ever used. I've used all of them, and these have a better seal, are more comfortable, are lighter but still strong, and just produce better stretch and pump regardless of electric or manual. I didn't expect there to be a difference but there is. More thoughtful engineering is demonstrated with these, and the slight slope to the insertion end may be the slightest detail that makes all the difference. The comfort gasket is excellent, too. You'd think others would have this, but alas...not the case. Get several sizes, because you will grow fast and can save money. My favorite chambers above thick wall or elliptical. If CTC ever makes an elliptical...get it, too. Very impressed. Pleasureful and very functional....

These things are the best invention I've ever used. Not simply for the pump-enlargement function but as a cockring these are the most functional things for intercourse in the world. The silicone is soft and wears excellent. They really do help girth and length noticeably. Since pumping is a vacuum, which is a negative-force, cock cushions are compression, which is positive force. These things combined with a pumping regimen create a terrific -/+ effect known as vacuum-compression therapy. These things are a must. Get them and you will toss everything else out. Promotes a fantastic erection....

This is a terrific manual set-up for ease of use and those who are just starting out or those experienced pumpers who just need a simple tool that works great at a moment's notice. CTC's cylinders may seem like any other but they really are better- in lightness, seal, and comfort -and you will notice right away. This is a fav of mine, easy to travel, and does a better job than most more expensive. I recommend this as a must-have adjunct if you have one of the electric pumps....

This pump is great. The software is simple and fully-customizable. If you have a Mac, like I do, all you need is Paralells and Windows installed and it runs it perfect. The suck-release works great and the actual hardware is a very unassuming little box that needn't be stored privately- inconspicuous. Use with CTC's cylinders (which are above the rest) for maximum pleasure/function. Well-worth the money if you're a dedicated pumper and want to take advantage of technology....

Just set up a group for those that have the Digi-Pump, place for sharing experiences and share presets; http://uk.groups.yahoo.com/group/digitalmaximizer/...