I had a GP12 400SMX (I think that was the model name). Mid 90s ish 400W amp head. Only issue it had all that time was that it needed a new fuse the first few months (never had an issue ever again!), and I had to replace some of the plastics on the front/back panel occasionally.
Absolutely superb. Build like a tank. Extremely heavy though, and awkward.
Would I get it again? Absolutely.
The closest I have come to it is the Genz Benz Shuttlemax 9.2, which I am never parting with!
The old Trace stuff was over engineered and looked superb.