I purchased a GFA-555 mkII in 1986 and a GFA-2535 in 1994. Both are still in use, the only time they have been turned off has been when I moved three times - both work flawlessly and sound great.
_________________________
Current system:
Outlaw 950
Mac Mini with Blu-ray player
direct tv box
Benq PB2250 video projector
Boston Acoustics 690 fronts, Polk Audio CS-250 Center, Boston Acoustics HD-6 rears, Infinity Powered 12" Sub with ROBOS