I have a Hafler DH-220 that I use with my drum machine.
It has never required any maintenance, just sits there and pumps out the sound.
I think it is bullet proof!
I use a Hafler P3000 fed by a Mesa Boogie Studio Pre. Sounds great. I also have an old 500 power amp and the TRM8 powered speakers that I use in my studio. I think they make excellent power amps. Good top end and tight low end.
Great power amps. The older stuff as well as the newer Trans-Nova series are great sounding amps. They have that sweet mosfet sound. Probably good on steel.
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Brad Sarno
Blue Jade Audio Mastering
St. Louis