I picked up a used sunburst 2007 Stagg EUB for $250 from my local GC; it had the carrying bag but neither of the optional shaped-form attachments. It sounded nice and played decently, although with high action.
I dropped the action down pretty low when I got it home and it developed a "quack" when findering B on the A string. After swapping some old strings onto it, I decided (hoped!) that the A string was just bad. Ordered a set of D'addario hybrid mediums, and they made a big difference. I adjusted the relief in the neck (there's a truss rod) and got it set up with a nice low action -- faster than my DB (which has a low action, too: 6mm to 4.5 mm, E to G). But no buzzes or other strange noises.
Unike some others' comments on this thread, the position markers seem to be pretty accurately placed. The tone controls are pretty basic, volume and a bass boost. I run it through my pedal board, so can adjust tones that way. It has a less "woody" sound than my DB plugged in (and recorded), but does not sound like a fretless EB -- at least, not my fretless EB.
The bridge sucks, because of the curve it has. I started to file the slots a little and discovered that the parts are maple hardwood, with some kind of resin/epoxy paint. I'm guessing all the black parts are all the same, including the neck and fingerboard. Any way, I bought a couple blocks of ebony and will carve a replacement bridge to get it closer to an accurate bass bridge shape. Bowing it seems a little more difficult than on my DB, but I don't bow much anyhow and probably have poor technique.
As for "what use is it": well, it's fun. No, it will never be my number 1 bass, but I have several basses that will never be my number 1 bass. I take my DB on acoustic gigs, and can take the EUB to play electric gigs when it might suit the tone or temper of a song better than the jazz. And of course, there's the novelty factor, as was alluded to in another thread. But considering the price was the same as I spent for an Ashbory -- well, I've found it to be more useful than that. At least it stays in tune throughout the night and doesn't require cornstarch on my fingers . . .