7 Gates of hell are more for decoration then for play. Once you get hard in one of these things you can't get it off until you go completely soft and by then you can be in some serious pain, as well as possible damage. I had one years ago and actually cut it apart for the various rings, the small ring is great for just around the shaft but again, it can get way to tight.
I have always liked the leather snap kind myself, since if they get to tight you can always pop them off easily and not worry about having to wait till you go soft.
I have developed a liking for ball stretchers these days, however finding one I can actually get on is very difficult for me since I have rather large balls, but as a bottom, they aren't really needed so I don't really wear them anymore. I did have 3 ball stretchers custom made for me, the 1 is a bit to large the other 2 are a bit to small. I can get the 2 inch on but it takes some time to actually get it on and my balls really need to be very loose to do so, I haven't been able to get the 3 inch on yet.