I noticed a change after two to three days of pumping. After two weeks of use as recommended, the difference is clear. What's changed is that my erections are much harder and longer-lasting in general, with a 2 to 3-centimetre size jump when hard. When soft, the difference in size shows, too. This device works the penile muscles and gets the blood flowing where it should. My penis feels firmer since using the pump. My wife attested to the difference, telling me it looks healthier and feels much harder. I've been using this with the jelqing Max Out cream and I'm happy with the results so far and intend to keep using it for increased gains.