I also had to trim the sleeve in order to get this pump to fit. I shaved my ***** hairs and was actually able to use this pump without the sleeve, allowing for the base of my ***** to get more girth too. This pump is awkward to use your finger over the quick-release valve for a long period, so I recommend putting a piece of tape over it, and then detaching the tape when you are done.
The first few times I used this pump, I did not notice much results... just turned my ***** red. About the third time using it, I used it for a prolonged period, and slowly pumped until the head of my ***** reached the top of the pump. At that point, I kept the pressure on for about an hour, pumping every few seconds. I was shocked when I took the tape off and my ***** didnt deflate! I ****** off after that, and my **** felt like it was completely foreign... didnt even feel like my own, thats how much it grew... but it wasnt hard. It was just like a big, soft sponge. Even when not *****, I notice that my **** is bigger. I didnt tell my gf about this toy, and she even asked me if my ***** was bigger, so she must have noticed (or she was snooping around and found it).
Id say its worth a try, but like the website says Im not sure that the results are permanant. I think that it increases size, but the tradeoff is that you lose some hardness.