This product is awesome and awful.
My first impression was bad, because it looks like a prototype more than a finished product. Its software looks old and has no compatibility with Linux. The camera is a ps3 eye with some mods (they hid the ps3 logo with some black tape). The light from the camera is annoying (there's a mod using infrared light for that). The drumsticks are light and cheap.
I thought I wasted my money, until I started to play on it.
The response is surprisingly good, almost no latency and easy to get used to "hit" the air. As the box says, it's not a drum kit, but it's fantastic for practicing some songs in a flat without making noise.
The price is quite high for an "outdated" product (the version 2 is coming fixing some issues).
In summary, despite the cons, I am happy with the product.