Which vibrating cock ring is the best?

Captivating topic discussions on Cock rings:

Aventurine v Agate v Titan v Omega v Fury: which cockring is the best?
I would like to hear some opinions on these cockrings. Which one do you like the most and why? I thing that it would be the best to focus on three...

just wondering
A gentlemen has mentioned in comments he had a burning effect. Not like skin burning just irrotation burn im assuming. Has anyone else used this...

Breast pumps
Which is the best?

Do Male Performers Use Erection Pumps ?
We have often wondered if they have aids before doing the deeds. In many of the movies we have seen the guy is already rock hard. Not hard, ROCK HARD

Has anyone ever had a problem with a cockring?
We've all heard the horror stories, I'm just wondering if anyones actually gotten stuck or if I should stop worrying.

Would you mind telling is the qualities you are looking for in this product?

For example you might want to grind on your partner's "equipment" so you might be looking for something with a moderate to strong motor or maybe you might want something a little more gentile. Help us help you...