mine had slight rub marks but they cleaned up and the web app seemed really nice but no way am I gonna do these without a par meter.He replied today: "Looks like rubbing mark from cardboard package during transit. Will not affect performance. I want to use eco-friendly packaging so stay away from Styrofoam and minimize PE bag. Unfortunately, units will have some transit rubbing marks."
There are some preset profiles you can use. My experience with the web app has been great so far (simple & easy to setup).