I had e64 for a long time
I know good and bad sides..
Good upgrade is to jum prom standard 1mb system ram to 2mb system ram so that way you can use v 4.01 and higher
wich improove midi timing and fix some bugs!!!!!!
also old eos samplers have problematic LCD display backlights!!!!and sometimes display just dies (thats no big problem just change fransistor under Hi voltage trafo for display) its not hard lolocate it but if you dont know about this fixing can be pain!!!! I KNOW
