I have used them three times in the past. My erection is normally 7" long and 5-5/8" around. While using the penis pump I attained over 9" in length and 6.25" around...but this was only while in the tube. The instant I pulled it out it deflated and wasn't really hard at all. I tried a cock-ring to keep the blood in after I removed my penis from the pump, but it didn't really keep the blood in and my "erection" was pretty soft, although large. I am not convinced in anyway that a penis pump works for sex, and can actually be dangerous when not used correctly.