Anyone tried the Aten USB-to-bluetooth KM CS533?

[nodnerb]

Was thinking about modding an existing usb keyboard/mouse to bluetooth and came across this:
http://www.aten.com/products/productIte ... l_no=cs533

The CS533 Tap is a control unit that allows access to one computer and two Bluetooth devices from a USB keyboard and mouse. The CS533 Tap converts normal USB keyboard and mouse signals into Bluetooth connections to allow for easy sharing between your computer and bluetooth devices.

This looks fantastic! Hello <insert favourite mech board here> + iPad...
... also, it might be the only way to get a decent bluetooth trackball!

... but before I pull the trigger and get one, has anyone got any experience with one? Are there any limitations?

Thanks!