IMO it is to early to tell.
I don’t know man, I have been extending now for 4 months, 5 hours EVERY DAY, half an inch above my BPEL and I haven’t seen any gains, neither EL or FL, NOTHING. The only change I have noticed is somewhat improved EQ. To be honest it really makes me question extenders, and it really is hard to continue when you don’t see any signs of it working. I guess I will be forcing myself to reach 1000 hours, but if there is nothing at that point, I can safely assume that extenders don’t work on anyone.
Some variables to think about: Are you using the extender correctly. For instance, it took me awhile to realize I needed to get enough skin feed through the base. Are you training too hard (everyday may be too much), or are you being inconsistent? I went through a few months were I was training too hard, and didn’t get any gains. Also, I think diet and exercise play a role. You need proper nutrition to build new connective tissue. I know a lot of PE’ers take arginine, but arginine competes with lysine, and lysine is needed to build connective tissue, so try adding lysine if you are taking arginine. Time taken doing PE can be time not exercising. Exercise will build up hemoglobin, and testosterone levels.
Regardless, 4 months is not very long to be expecting results, but it is long enough to start thinking about what you could be doing different. It helps to make your PE pleasant, and then it won’t seem like it is taking so long. I found my Penimaster uncomfortable, and I would have given up, but I started using Vac3 extender with it, and then went on to just hang weights equivalent to my Penimaster tension 4 to 6 hours a day from just the Vac3. I can wear the weights for most of what I do, so they are comfortable, and do not take up much of my time.
I think most PE’ers start out being skeptical. I doubted it would work, and even now that I have some modest gains, I have to keep checking to make sure I still have them, because it seems surreal.
The other thing to consider is if it is worth your time. Is spending a year or two for an extra inch or two worth it?, and that is a totally personal thing.