For how long have you been using it?
20 years

What thing do you like most/least about it?
a very good quality and are an incredible robustness!

What is your opinion about the value for the price?
very good even now it is all outperforms amplifiers is called "professional" made in how I do it ".. You can find opportunity in the 450 €.

Knowing what you know now, would you make the same choice? ...
Yes, no problem!