I have it! The full size one, that is. I'd get the one that plugs into the wall, as I heard that the rechargeable has bad battery power.
I don't have a Hitachi, so I can't compare very well, but I think they are along the same in terms of size, shape, and power. The Fairy Wand is multi-speed though, which I like. If you need a lot of power, it is GREAT for that. I usually need about 4 vrooms, I'm a power queen, and I usually have to use this one one of the lower settings. However, sometimes it gets me off very quickly and other times, if I use it too long it numbs my vagina.