For how long have you been using it?
Over 10 years

What thing do you like most/least about it?

Reliable, powerful, dynamic, not heating, very good for bass but not to drive full-range speakers as we see immediately that the lack of presence in the treble.
It is a MOS transistor amp, a sound that raproche that of tube amps.
It's never crashed, it's very robust. It is lighter and no longer deal with him.

What is your opinion about the value for the price?

Very good, considering the price of the occasion.

Knowing what you know now, would you make the same choice? ...

Yes for subwoofers.