Nakamichi cassette playback in non-Nak deck?

I've been considering investing in a good used Nak 3-head deck for home recording (DR1 or DR2 or similar) - mainly to make high quality tapes for playback at home and in my Sony walkman and Blaupunkt car deck. Yes, I do own an iPod (1gig shuffle) which I love but cassettes are still cool, too!

Anyway, researching online I came across a bit that stated playback of tapes in a non-Nak deck may be a bit disappointing due to the fact that Nak apparently uses a very narrow gap recording head to magnetize the tape which "ordinary" decks cannot fully playback, leading to a more muddy/muted sound with less soundstage vs. playback in a Nak deck. Anyone have any experience with this?

My walkman is the high-end 10th anniversary edition from 1989 (wmf-701c) with dolby C and laser amorphous head. I believe it is a narrow-gap design with 20-20,000 freq. response with metal tape and S/N better than 70dB with Dolby C. I should say that the FM tuner in the walkman sounds arguably as good or better than MP3's on my iPod at 192kbps! It's a quality deck and I think it would be fun to see how a really well-recorded tape will sound on it. Would a Nak work well in this case or should I find a used Sony ES 3-head deck for best results instead? -jz