I bought this new back in 1985. It is has a plastic case that is grey. A year after I bought this, Arion changed the design to the black plastic case, and the sound quality just wasn't the same. They ruined it. I'm glad I have mine.
Nothing compares to it.
If it died I'd have a hard time replacing it because most other distortions are so nasty sounding. As for feedback at high volumes, I've never had a problem. It's pretty easy to get a descent sound out of it, but you have to play with it for a bit. Kind of noisy though. 7 Right now I'm using a Yamaha Pacifica 102S as my main guitar and a shitty-ass Squier amp.