Well Dave,
I haven't dealt with AmigaKit before, but my first purchase was a complete fail.
I purchased a Cocolino PS2 to serial adapter and it simply does not work on my CD32.

Matt has sent me back a response that reads in part "The mouse port is a funny thing. It operates on a finite line. So the extra circuit stuff in cocolino is drawing more current and this will be causing issue.
You will end with the same issue with every mouse. Unless its a proper Amiga mouse (no adapter)."

So, basically "it doesn't work".

Not real reassuring considering who is going to be selling the X5000.