Just upgraded this past winter to the new Krell KAV-400xi integrated amp. Best so far, but the Hafler is still going strong in my brother's system. Previously owned:
DeWald integrated tube amp, about 30 WPC (fried) 1960-1978
Nikko integrated ss amp, 40 WPC (sold) 1978-1980
Hafler DH-200 ss amp, 100 WPC (donated to my music starved brother) 1980-2003
Odyssey Stratos ss amp, 150 WPC (sold) 2003-2004
DeWald integrated tube amp, about 30 WPC (fried) 1960-1978
Nikko integrated ss amp, 40 WPC (sold) 1978-1980
Hafler DH-200 ss amp, 100 WPC (donated to my music starved brother) 1980-2003
Odyssey Stratos ss amp, 150 WPC (sold) 2003-2004