I bought this ring because I was looking for something to put on my glass dildos. It seems a bit too girly and precious to really be appealing to most males. Though, that of course will vary with the individual. It should fit most dicks of average girth. I'd suggest this for either a couple looking for a cheap, non-threatening thrill or someone who wants to upgrade their personal dildo/vibrator into a dual stimulator. It IS cool that it's waterproof, and that the bullet is removable/replaceable. You could even simply take the bullet out and use it if you got tired of the ring. It's not a big investment, and the material isn't too dangerous. It should not be shared or used for both vaginal and anal play because TPR is porous.

It's definitely got a smell, though it is not as offensive as some toys I've seen. The bullet is plastic and hard. It is a pretty standard bullet. The butterfly is made of stretchy TPR, which collects lint and is fairly easy to damage.
I do have to give a warning though. Because it's so stretchy and sticky, if you don't shave or wax you have to beware that any little hairs don't get caught. I trim fairly short, and I still noticed I would get caught sometimes. If you accidentally pull the hair of your partner, I can't imagine it's going to be fun for either of you.
I noticed that it came with a decent sized defect in the tail, as well as several other defects. I don't think they really effect my experience as none of the defects are on areas in direct contact to the genitalia. The entire thing seems to be made of seams, and I can imagine if one of those defects was on the inner part of the ring it might be painful for a man to wear it. The stretchy material is very forgiving though, so I wouldn't worry about it too much.

The vibrations aren't super intense. The bullet didn't hit my clitoris with any sort of accuracy, and the wings just kind of slapped my labia. Its shape seems to be more for visual entertainment than for functionality. The "fluttering" action can provide some interest in that you never know what it will touch next, but the tail never touched anything significant. The head didn't seem to know whether it wanted to bury itself in my pubic mound, my clit, or even my urethra. As far as the shape of the nose of the butterfly goes, the ridge of it was almost too pinpoint to do any real good anywhere except when it touched my clitoris, which was rare. When it did hit my clit, it was nice but nothing amazing.

It's very stretchy, so it should fit most guys and wouldn't be too scary for someone unused to wearing a cock ring. I doubt it would really give much vibration to the wearer as the bullet's connection to the ring isn't very sturdy.

I bought this to put on my dildos to provide clitoral stimulation. Honestly, I was disappointed. I think that has more to do with the general functionality of this sort of cock ring and less to do with this specific toy. Although I probably wouldn't replace it if it broke, I'm not regretful that I bought it. It was a fun experiment.