For how long have you been using it?
I used it for ten years now. it's an amp that I received from my grandparents and must be about 25 years now.

What thing do you like most/least about it?
What I like most is its sound quality and power. I've never found better-quality amps today, even with "home theater" brands worth in the 600 €. Its 3-band EQ (low, medium and treble) and its loudness function can have perfect sound from even average-quality speakers.
The least -it only has little input connectors (5 x 2 Stereo RCA, 1 pair reserved for turntables)

Did you try many other models before getting this one?
This is my first amp, I've had others since, but none has equaled it (I have had Pioneer, Yamaha and Denon also).

What is your opinion about the value ?
I can not say anything over there because I do not know how much it costs now, and the amp does not sell anymore. However, used it has a very good price (100 €), it is largely the same after 25 years. This amp is simply unstoppable, and often asked for a lot of watts to power PA speakers and a subwoofer 500W RMS.

Knowing what you know now, would you make the same choice? ...
If this amp were to give up the ghost, I would re-buy without hesitation.