Er, the reviews I found were pretty helpful to me. From my understanding, there are three balls, and you apply the two smaller balls to the clit. It's not meant to be used as an insertable toy. I hope this clarifies the use of the toy for you
As for price, it comes from the luxury sex toy company Fun Factory which pretty much prides itself on its high quality silicone and safe materials. It's also rechargeable, so you won't be spending a ton of money on batteries, which some people find is a major plus. Toys that use batteries tend to have shorted lives than rechargeable toys- and of course, they're environmentally friendly
personally I would pay a lot of money for a nice, environmentally friendly toy that will last a few years than pay again and again for a toy that's going to crap out on me.