I've had the WAV for a couple of weeks now, in the amberburst finish. I tried out the blue and amber versions side by side, and preferred the playability and sound of the amber one - lucky for me, as the metallic blue see-through really didn't do it for me.
Superficial comments first ... The dark recesses of the peghead are finished poorly, and there are some rough filing marks on the inside (see attached picture) - but hey, check out the price tag! The stripey maple is pleasant to look at. The ebony fingerboard looks pretty solid, not quite pitch black, just some small patches that have light streaks, and no knots anywhere on the surface.
The action was a little low, and in higher positions the strings were choking on the end of the fingerboard. (Same on both WAVs I tried out.) I wanted to straighten out the neck with the trussrod - but for that you need a 3/16" allen key, which was not included in the package (remember the price tag). Living in a metric society it's very difficult to find inch-sized tools. We have a 5 mm driver that is just too small, and a 6 that is just too big.
For the time being, I raised the bridge. Here I discovered that the backplate is an area where they should really consider improving things. The back plate on the WAV is a single metal plate that is screwed into the body, with two small openings for adjusting the bridge height, and four larger openings for hooking up true DB strings. With a screwdriver, I could just reach the bridge height adjustment screws, which were not in line with the openings in the back plate. I nearly removed the backplate, until it dawned on me that you shouldn't unscrew the back plate too often if you ever want to use real DB strings ...
With the bridge raised a little, the strings no longer choke and the action is still comfortable.

The back of the neck is huge compared to a BG, but you soon adjust. The back of the neck is satinized for the most part - it looks a bit odd with the dark finish but the satin feel is very nice. As a side-effect, you absolutely fly when you take up a teeny-weeny bass guitar again ...
This is a big log of wood, so there is plenty of sustain and there are hints of the deep DB sound, with some sweet spots on the A and D. However, the E string seems to lack a bit of fundamental, and the G string is a bit nasal. I'm pretty sure/hoping/guessing that these are weaknesses of the standard strings.
When plucking strings, only the "down" position (pizz) of the polarity switch gives you a decent sound. In the "up" position (arco) I can try all sorts of ways of plucking the string - sideways or from the top, index and middle finger joined or stacked, striking down or across - but it's no use, you get a nice acoustic attack and a bit of "air", but little to no sustain - and you can forget about using the G string. Perhaps this setting works for bowing but it appears to be useless for plucking. The pizz position is more BG-like in nature, but you can definitely tell it's not a BG. On the upmarket models, they've replaced the pizz/arco toggle with a blend control, which sounds interesting - but those models have a pre-amp, and the WAV is passive.
The tone control is interesting. You need to roll-off the highs, because this EUB sounds bright beyond reason, but the tone stays useful all the way to the lowest setting. Perhaps in a band setting you might turn it up over one third. But even then ... on my Workingman's 12, I switch off the tweeter completely and set the treble control at 9 o'clock, and you have more than enough treble. I'm hoping to try out darker sounding DB strings soon.
So far, I'm very happy with the instrument. The tripod stand is holding up fine in my living room, with the bass at a jaunty angle - the E is just leaning over as on a full-bodied DB - but I have no way of telling what life on the road might be (stand-wise). The bass does dance a little on the stand as I play, but it feels perfectly natural.