I have been in biz for a few years now. I have seen less then a handful of cock rings.
I believe that they are a terrific alternative to ED meds, in some cases of course. I would recommend trying one, either for fun or for a better boner.
The gents that I have met who use them, use them because they need to. IMHO they are not just for alternative purposes.
One client, I have seen several times could not have an erection at all until he finally tried a ring. That was our first fs appointment and it was a success!
Rings have many different styles and ways to wear them. Some gents need to take them off in order to finish and some wear them until finished and take them off after..
They really aren't anything ALL that exciting or strange..unless a bigger boner that lasts a bit longer does it for you..

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Add a lil celery and OH eh?! ..how you doin ?!..hehe