Hi there
I have been pumping for 20 years and I sill love it. I gained over 2 inches in length, girth seems to come harder to achieve for me. The gain is very slow and not noticable just in a few weeks ( permanent gain that is).
Latlely I have combined pumping with tying off the cock at the base while in the vacuumcylinder. The cock feels like it wants to explode with all the blood traped in there and the pressure is enourmous. This has fast gains in girth for a short time, but I think that over time some of that will become permanent. It is slightly painfull, but no gain without pain. I like that anyway and I noticed that after I take off the rubber band and jerk off, my orgasms are much more intense with huge amounts of cum.
I will keep pumping, I love it