I've had a Dragon before and still own a ZX-7.The 681/682ZX's in my opinion easily out perform my ZX7 in terms of playback (and build quality).
Even my 480 sounds better than my RX-202E,again i sometimes have to wonder how much of the MRRP went into the RX-202's trendy unidirectional auto reverse (rather like the dragon).
We'll have to agree to disagree
Auto-Reverse is not the issue.
The Dragon's biggest advantage is auto-azimuth. It set's it apart from all other decks.
Unless you can match the PB azimuth to a signal that's been recorded on a tape, then you cannot to begin to get the best sound. It's just basic fundamentals.
Take a tape recorded on, say a Pioneer CT-F950, now play it back on your 682ZX, sounds good? It should, 682ZX is an awesome deck. It sounds good on my 682ZX too.
Now, swap that tape over to the Dragon, and wow, a jump in clarity and HF response. Dolby tracks better too.
Why? Because the Pioneer's alignment was different than the 682ZX, so some HF information get's lost. the Dragon however, just adjusts it's PB head and get's a perfect track.
As long as the Dragon's NAAC is working 100%, than it will find the best PB azimuth quickly, and flawlessly.
No other deck was designed to do this, other than the Marantz SD-930.
There's nothing "trendy" about NAAC, it's not a gimmick, it was designed to get the most out of every tape you can throw at it, from every source. Auto Reverse is just a bonus.
Not sure how you can say the 682ZX has better build quality. They both have the same transport, made from the same materials, the ZX-7's internal layout is a bit cleaner too.
The 682ZX does however beat both the ZX-7 and Dragon in the Meter dept. Best looking meters.