Given an Onkyo Integra M 504 today. Worth keeping?

My neighbors just went through a nasty divorce and the wife asked if wanted this "this ugly heavy stereo thing that I don't want and can't pick up."  I said sure and brought it home. I have never heard anything from this line, but it is gorgeous and looks like it's been very well cared for. 

Is anyone familiar with this amp? Just curious if it's worth keeping and how it compares to modern amps. I am actually in the middle of revamping my 2 channel system and do not have a preamp at he moment to enjoy those giant meters! 

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That was my thought as well. Isn’t that what we all would want to happen to us? At the very least, give him a call.

We were dealers back in the day, the m508 was the one, the m504 was ok- free makes it better though

If that’s the one I think it is, it cost about a grand new, had sexy VU meters and got okay reviews.