My 2sen view on ol'skool amp. If you can get in good working condition at great price, grab it. Most of them are sonically good enough for newbie. The good and not good thing is that since they are mainly 'pure' amp i.e without features such as crossover, bass boost la etc, you need to have the function via HU or external crossover. But similar to 'pure' deck/HU, you get the money spent on quality. The amps never clipped and stay clean through to high volume.

Personally i have 4 equipments older than 10 years in my setup. 2 of them are close to 20 yrs old. Most of the others are >7 yrs anyway. My friends with newer equipments also agree that for the money spent, its well worth.

Just be careful that bcoz they are old, do not push beyond their limit esp buying SQ ol'skool to be used for SPL. Give them some headroom. All in correct gain setting.