Thanks to John Borofka for great feedback on his recent purchase. We take your feedback and suggestions seriously. If you're thinking about buying an E3 you need to read John's letter.
Squareness of end of supports - I found that a portion of the smaller laser cut pieces weren't square on the ends, as if the laser wasn't firing directly downward, or the stock was lifting off the table when cut. I have a few photos of this if you'd like to see. The result was that when tightening these pieces (mostly supports), they'd have a tendency to fit a few degrees off of square.