Is it worth it?
I'm so attached to my my poor old Hafler P500's but I just picked up a QSC PL340 to run my 18's and the QSC is so much better sonically than the Hafler. Of course the QSC has a lot more power, but running them at lower levels the it still has a much nicer bass response than the P500.
I've put some IXYS HyperFred bridge rectifier's in the P500's and maybe I should replace the power supply caps but that's all I could do that would be somewhat cheap. Driver board replacing gets expensive!
I put the P500's at the bottom to anchor the rack down!
Really got to get rid of that particle board!