OpenOffice Mouse - 7 buttons for each finger

After debut of Apple's Magic Mouse - a super well and smartly designed piece of hardware, OpenOffice Mouse produces mixed feeling. The bulky and very impressive design that places 7 buttons under each finger might require extensive training to use. (Piano players will have a definite advantage using it). The thumb button makes it look like a toy from Master Mind. There is differently coloured version of on OO website but it doesn't really help.