Yeah, having played both side by side, WOZ *feels* better made, yet thus far with my experiences with WOZ, it always seems like it's breaking, just not in cosmetic ways (though I have seen plenty of dimpling in the clear coat). Every time I have watched a WOZ at the end of a long night of location play (at tpf, and at joystix) I have always seen something go wrong in a big way. The LCD graphics always seem to get slow and stutters as the night goes on, I've seen tons of problems with GI and even insert lighting going bad, and this last Friday, the vuk died so rescue wasn't working. For reference, joystix only "operates" it's pins for the general public 2 Fridays a month from 9p-2a, so that's less than half a dozen route days for the machine so far.
Again, build quality *feels* great, but even with that they have issues to work out. Hopefully the manufacturers or the market will provide solutions to these issues, but one would hope QA would improve to the point where these machines ship without these issues.