Question about buying a used oberheim edp

["steve.sandberg" <steve.sandberg@earthlink.net>]

I've got a chance to buy a used oberheim edp --
have been told it's in great condition, has only been operated in a smoke
free studio, has fully expanded memory (198 sec) and loop IV upgrade -
i've only owned gibson edps up until now, just wondering if anyone knows if
the oberheim edps are just as good, not too old to buy for $650 now, etc.
etc. - 
am i worrying needlessly about its age and the fact it's an oberheim, not a
gibson?
thanks.