Well, against my better judgement I am going to provide my blunt opinion of ADS. Admittedly, I have only used the static stretcher (medium), but most ADS have similar mechanisms.
Basically, I believe ADS only provide serious gains for flaccid length. I have worn mine consistently for a long time, and researched a lot on various forums. The idea of an ADS sounds great, but unfortunately getting the amount of tension needed to generate serious erect length gains is nearly impossible. However, with the tension generated you will probably end up seeing smaller gains in a few months - if you are able to wear it 15+ hours a day.
Since I see very little benefit in doing so, I wear my ADS whenever I am out of my home. This consists of wearing it from 2 to 7 hours usually.
While in my house and not hanging, I wear two of the wraps provided to me by the manufacturers of the static stretcher to keep my penis almost fully extended (at a 6 inch flaccid, versus a 7 if I wear the whole mechanism). The purpose of this home part is just to ensure that I don’t turtle. I also sleep with these wraps on - very comfortable.
As for serious length gains? I hang. That produces real tension, the tension needs to see tunica gains. Can you were an ADS longer? Yes, but at a much lower amount of tension. I’m not suggesting that hanging for an hour or two is very much better than wearing an ADS at a high tension all day. However hanging at four hours a day (as I do) is far better.
Just my 2 cents.