I cant see it saying anywhere that it supports the mouse wheel or extra buttons, is it just a two/three button mouse adaptor?
Also those "fancy USB-PS/2 converters" need a mouse that supports PS2 internally as the adaptor is just wiring a USB connector to a PS2 connector. I dont know of an active USB to PS2 converter.
If I was to buy one of these over the many new/Old Stock Amiga mice selling for £10 then it would need mouse wheel support, like the Elbox unit.. but cheaper.
