Yours is a 1990, right? You got one of the good ones. They are all nice guitars, but those early 90's models are superb quality. I just love that ebony fretboard!
Mine's a 94, from their centennial year. After I got mine I noticed the quality of the studio line really went downhill for a while up until around 2003, 2004. It's been better than it has been, but those early - mid - nineties studios are still their best ones.