A home-made ADS (like golfweights) will mostly just cement your gains. However, an ADS like the penimaster or others could probably be used to make some gains. I’m sure there’s some good home-made ADS as well—but my biggest concern is that you might not know how much force you’re applying with them. At least with a professional ADS things are more controlled. Really, it just depends on your budget.
Personally, I’m hanging with a bib hanger and I may be adding the use of golfweights as an ADS (think more of the golf weights as an anti-turtling device… the amount of weight is so low it wont have an impact at all on me other than keeping my flaccid from curling up / retracting). My fatigue and in turn deformation is coming from hanging. The purpose of the ADS is just to help me maximize the gains I’m getting from hanging, by healing my unit heal in an elongated state.
With golfweights, you’ll have trouble getting more than 1lb (its not much). With most ADS, I don’t think you can get more than 5lbs of force. Over a long, extended period of time, this can be somewhat effective. However, an ADS alone wont do much.
Overall, the ADS will work much, much better (in my opinion) if you combine it with at least a basic PE routine… that includes Kegels, Jelqs, etc. (or hanging!) Like I said, from my point of view, an ADS is ideal for preserving gains—by itself I’m not sure you’ll gain too much. This is just from my perspective and what I know. I’ll be interested to see what others have to say.