I started wearing them on and off about 2 years ago and for the past year I've worn them pretty much all waking hours. I have mostly stainless steel with a few aluminium ones. Some are heavy. Some are light.
Comments are usually "Nice ring(s)" with a follow up question like:
Does it make your dick longer? -- No, but it does make my dick spend more time at the long end of its natural long <-> short cycle and less time at the short end.
What happens when you get hard? -- I take it off.
How many do you wear at a time? -- It depends on my mood. Less weight -> more bob & swing. More weight -> more pull and tug.
How does it feel? -> Pretty damn good
I have to say, they're a good conversation starter. More than a few guys have asked to feel them, so of course I oblige;-)
I should mention that if I'm walking around naked with the rings on display I'm in a venue that's 90+% gay male. I've no idea how straight men or women might respond.
I've never had a comment at a public urinal.