It's a pretty good amp, not great. I have seen them in good condition go for well over $500. And depending on how old it is was probably between $1k-1500 new. So to answer your question, the quality is good, as to the sound, that is subjective, you are going to have to check it out.
Regardless, unless it is fried, you've found a bargain.
Regardless, unless it is fried, you've found a bargain.