A few impressions:
Solid metal casing. Only the bottom plate seems made of plastic. The photog-oriented, screw on gadget on the top is removable - and the unit comes with 4 rubber plugs to put in the screw holes if you choose to remove it. The battery/card-slot door is also plastic. It does seem a bit fumbly. All things considered, the little plastic hinge thing may be more durable than a mechanical/metal solution. The batteries actually have their own metal door under the plastic hood.(which has a solid hinge and closer) Since most of us will use an external battery, and getting to the card is easy.(compared to working with the battery door) - not a big deal. The red handles make nice stilts/stand for working on the battery side without hurting the screen or knobs.
Knobs move nicely, just enough resistance to make your adjustments smooth. I don't think I made enough adjustments to notice any unusual, though (re: zipping sound)
Unit recognized something on the USB and asked me what I wanted to do - Power or Data.
Backlight stays on continuously when on USB power. Cool. I like to watch. Titled screen seems fine - and at a good angle. Might be too extreme for those who want to run vertically, with your bag at your feet.
Meters combined with the LED peak light make it easy enough to keep a handle on things. There is a little indicator that shows the latest peak in the last X amount of time - but its not clear what channel its attributed to...and it's tiny!
XLR layout - angle/stubby plugs will be the best. Full size XLRs are half the width of the unit. Worked ok in my laptop bag - but will be getting some new cables! Nice combo XLRs take 1/4 inch inputs also. Ultimately, I will make ALL of my cables angle plugged for this unit.
The one dream feature this unit needs is a "solo" feature to make the screen display a single channel - and all of its (more detailed) gain info.