For those of you expecting to get a porn star dick using one of these... Well you will get a fatter dick for a few hours. I can increase my girth quite substantially after using for around 30mins. But this is just swelling and it will return to normal size thereafter. If anything, I would say my erections are harder therefore my penis looks bigger when not using the pump, and when using the pump, I get a right fat unit. But overall, exactly as expected. Good suction/seal.