It's working.
I gained 1.25 inches in length doing a kind of stretcher hanging thing which involved hanging 2.5#’s four to six hours a day attached to a Vac 3 for a year and a half, . I also gained some nice girth, possibly from jelqing with a small hand held hard rubber roller, but I never took measurements.
Anyhow, I think I have gained all that I will gain in erect size doing what I was doing, but I was disappointed to get very little in flaccid gains, so for the last two months I have been pumping using a modified Whisper pump, with an LA cylinder. I have a foot valve that I use to periodically dump the vacuum. I do this twice a day for a half hour each time, and I am starting to get a better flaccid. It is just how other pumpers said it would be. The results are lasting longer and longer after I pump. I wrap the tube with a heating pad. I go in flaccid, and it takes about five minutes to get up to my full size. Then I start to dump the vacuum every few minutes, and let it build up again for a few minutes. I still use my Vac 3 and hang the 2.5 pounds, but about half of what I was doing.
The Whisper only pumps about 4.5Hgs, but that seems to be enough. I am taking a day or two off per week. I am very happy with the results so far.