There will no doubt be exceptions and the Altec is fine example.
I have not auditioned any pro marketed main stream power amps of current day technology in recent times so I can't comment or generalise either way.
However in my travels recently I did hear some fine QSC, Amcron amps used in JBL monitor system and they performed very nicely and to the owners expectations which is what matters.
I also heard a MacIntosh power amp on current SOA JBL monitors and consider it to be a superior power amplifer (IMHO)although they are more expensive so that is to be expected . This observation appears to be reinforced by a review in a current Amercian Audiophile magazine.
That said I heard a Halco at show and though it was over rated.
Anyway I never make judgement calls on equipment unless in my own system for a reasonable period. Even then its like tasting wine and often blending is the key.
Ian