Agree with every word. I'm in a similar situation with an AH500, an AH300 and 2x AH150. I've had them all serviced by my local amp tech and they all play like new amps. Put out far too many watts considering what's written on the outside with tones to die for.
If anybody's into those 80s tones (whether it's rock, soul or funk) these are the kiddies to have. IMO nobody has surpassed the TE tonal package. I can't understand why everybody doesn't have at least one - weight isn't an issue with the heads.