Just got my GA645 from KEH yesterday. "Bargain" condition seems to mean "Ex" on this one - yes! The metering does seem a little weird to me, but I have to remind myself that I'm shooting Ektar 100 for a test roll - not the 200-400 ISO range I'm shooting on my other cameras. Also - it's not TTL - there may be more of a learning curve, esp with E6....
@ivansanzana - the round eyepiece can be replaced by a Nikon eyepiece/diopter/accessory. It's the smaller size - F3 (non-hp), FE, FM, Nikkormat. Not F3HP, F90, etc.