Step up from Nakamichi 582 tape deck?


Have an option to acquire a very good working order 680zx.
At present have a 582 and was interested if those in the know would consider it to be a worthwhile upgrade?

Or would I need to go even further up the food chain? Zx-7 or 700zxl or?

I have just purchased a massive lot of tapes at pennies per tape so do not foresee me forsaking this medium anytime soon .. Lol.
128x128uberwaltz
680zx is definitely a huge step up from 582. My personal experience, 680zx playback sound is very close to 1000zxl. It has auto record calibration and don’t forget the gorgeous meters on it. The only thing missing is Dolby C 
So probably no need to go further than the 680zx?
I think the one I am looking at is very fairly priced so may well take a chance on it.

Thank you
Well, 680zx is a warm sounding machine and has best bass of most cassette decks. If you're OK with auto record calibration then yes unless you find a screaming deal on a ZX-7/9 or 1000zxl. To my ears ZX-7 is a great recorder and a Playback machine but  it doesn't have the warmth of the 680.