I have a custom order GSG Graduate 60 and really like it for the most part.
I ordered it at a time I was left some money in a will and contacted GSG direct for an order as I wanted the 'normal' LP style tailpiece and bridge, not GSGs own wrap around tailpiece, I also provided the pickups (Duncans, before I'd heard of BKPs ;)) and also wanted a custom colour.
It took a few months and then I went to the factory to pick it up. I foudn out while there that they build their own machinery (as mentioned somewhere above) and the staff at the time consisted of only 3 people: John Smith - Woodworking and finishing, Chris (I think) did electronics and setups and Johns wife Linda did customer services and finance etc.
I've not played many other GSGs, so can't comment on how hit or miss they are, but I can say that there's nothing wrong with mine :)