Cock ring by PicoBong
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If you enjoy cock rings for the direct clitoral stimulation they provide, this one will disappoint. If you are interested in turning your partner's penis into a vibrating one, this will impress. The design of this ring makes it possible for you to use it for broad or pinpoint clitoral stimulation, either solo or with a partner, when you aren't having sex, which is not something a lot of other cock rings do well. It's a unique toy that isn't likely to be like anything else in your toy box.
Although this is designed as a vibrating cock ring, I used it for a bullet and used the cock ring on various toys to test how the vibrations traveled through different types of toys. It's a nice toy, but the cocept failed for me.
The PicoBong Koa is a strange and perplexing little toy, and although it is listed a vibrating penis ring, it isn't. At best, it does a suitable job as a bullet-style vibrator. So if what you want is a toy to fit snugly around you man parts, look elsewhere.
While technically and visually impressive, this toy fails to perform. The vibrations are weak, and the controls are poorly done. The functions are so hard to get to, they're almost worthless. The ring clip pinches instead of squeezing, and does not help very much. Truly a case of style over substance.
This combination cock ring and bullet from LELO is useful for vibrating the penis during sexual play, for hand held use on the clitoris, nipples, vagina and labia, and for use in powering dildos and even other vibrators. The clip that holds the large bullet to the penis is more of a "clip" and will not fit all men. Smaller men may find it too large and larger men may not be able to wear it without discomfort. The 12 function bullet is strong, quiet and well made.
The idea behind the Koa is solid but the execution falls through. The Koa does not fit comfortably to be compatible with almost any orientation of male-female genitalia that I am familiar with and is thus a very pretty, very overpriced bullet with a nifty ring handle.