OK, to add my t'penneth worth, I took a drive down to Romford on Saturday to take a look at this fabled beast. DV have a very nice shop, but as per most establishments many, many guitars....a few basses.
Tried the display model of the J&D, and for the money I was frankly amazed. Looks the business, very hard to see any issues unless you look very hard (SP fit around the neck a little off, match to control panel not quite spot on), the display model had some white marks on the binding that didn't wipe off (spit and finger). To play, the neck felt as fast as my highway one, I'm not a fan of high gloss necks but this plays fine. Nice sounds from both pickups, with a very nice jazz grunt when you roll the body pick-up right off. Both up full gives a very pleasing thud.
The long and short is I bought one, a boxed one from the warehouse. Inspected it for the marks mentioned above and all was well. Check out the intonation and action when I got home, and bar a couple of tweaks it was spot on.
I bought this as a 'Jam'/experimentation bass, which it will be perfectly good for. Saves me lending my pricier (I won't say better just yet) basses to the great unwashed.
Once I've had her out for proper play I'll report back, but if you are after a cheapy then you can't go far wrong with one of these.