Having owned the previous EUB500 model, I can say that this is much better sounding and more comfortable to play.
The neck is on the thicker side, but not uncomfortably. Fingerboard is very nice and feels high quality.
The neck-body angle is very shallow compared to an acoustic double bass, so it takes a few days to get used to it.
The body bracket attacment is useful, stable enough for slapping.
Sound and preamp is also nice, no hiss from the main output.
General build quality seems good, but the endpin rattles inside the body (solved by pushing some cardboard alongside it from the back cavity). The small screws used on cavity covers are very soft, they have stripped and became unusable after one dissassembly.
The one I got seems to have a slight crack near the neck joint where the wood is thinner, but it is stable without problems.
It is lightweight and balancing isn't bad. The endpin could have been thicker to make it feel less wobbly.