They tend to pinch on entry. Once being used they are not as bad, but a little big.
They can be used alone or with a small toy.
They need to make them more user friendly. They should come in more attractive colors and be easier for the novice to use. The pinching while inserting them make it hard to enjoy them. With a little work from the manufacturer they could be a great toy. Maybe if they were just a little smaller or if solid the size might be alright. The string that holds them together also makes it hard for them to move around so they tend to stay bunched together. Also, if they vibrated it might make them a lot more pleasurable.

That being said, they are easy for one to use and can be used solo or they can be combined with a vibrating toy. Although, that would be hard as they do not separate.

I have only tried them vaginally, but I'm sure there are other ways they could be used, especially if they were solid and vibrating. I am sure that if they did not pinch I would have explored them more and tried different things with them. It is hard to use a toy that causes pain, unless you're into that sort of thing. If they vibrated, they could be used for so much more. I think if they vibrated men might enjoy them also. They could stimulate the testicles, which I know men enjoy. Also, then the string would come in handy as you could keep them close to where they needed to be.

So, the toy overall is not that great. It needs to be revised to make it more user friendly and less painful. Also, perhaps make it more attractive and people will enjoy it more.