I just received one yesterday so I have not used it yet. But I will say the quality of the silicone and the construction is top notch. Ah hell, it is just sooo cute too.
Really though, the vibes are VERY nice and quite thumpy on the higher settings. The silicone is some of the best I have felt (I have felt a lot of silicone)
Another plus is the Lithium Polymer battery is the best you can get for a rechargeable battery. I would say that most of the cost comes from the battery, but it is sooo worth it. They have twice the power of regular batteries at half the weight. I play with hobby grade Radio Controlled cars/trucks/boats/plan es and they have been one of the greatest advancements in the hobby. They will do the same for sex toys too.