The moral of this story is please do not try to change the shape, size, or appearance of your penis unless it is medically necessary.
I don't doubt that many people have had good experiences with vacuum pumps for their penis. My experience started off great, I purchased a real one on line as opposed to a sex toy. The difference is in the pressure, the real ones can give you much more pressure.
I would use the penis pumper two or three times a week for 20 minutes each session and each time I was impressed with the results. Temporarily I would have this longer and much fatter penis that I would gawk at in the mirror.
After each session I couldn't help but staring down at this penis that didn't even look like it was mine simply because of the great increase in size in such a short amount of time. This would last anywhere from one to six hours, I even used the pump once before going to the gym.
One night, I was using it and the pressure release valve would not release the pressure when it was time, so when I finally got it off rather than having a large penis to look at for a few hours, my pump induced erection immediately went away and I was left with a penis that was flaccid and hurting and the next day the same thing. For a few days I noticed I could not get a normal erection in firmness or in size. Forget a bigger penis, I wanted my regular penis back and I really got worried when I saw something that normally would make me erect only make me semi-erect and a semi erection that didn't last. Long story short I made a doctors appointment but didn't need to go because the next day my full erection came back in size, firmness and duration and being so happy to see it I jacked off twice within a four hour period and this morning I woke up with my usual 'morning wood' just as healthy as ever.
The pump will never touch my penis again and will be destroyed and thrown away.
My warning to everybody out there is be happy with the appearance of your penis as it is, don't try to make it different. I could have become impotent and for what? For a few hours a day with a bigger penis, it does not make sense to me anymore.