On 28 April 2017 I conducted the first test of the ULCEKit. It was a class of 20 university students and lasted about 2 hours.
Most of the class did not have any electronics knowledge and there were some challenges in setting up because the CH340G drivers are not compatible with MacOS. With this in mind, the next set of devices will instead target the CP2104 drivers which are better supported and used by Adafruit and Sparkfun.
After the lesson, a quick survey was conducted:
Too expensive: $21
Too cheap: $3
Starting to get expensive: $15
Bargain price: $8
So it seems like the right price would be in the low tens range, which is close to the cost point of developing the goods.
Total soldering time was about 5 hours, and packing took about 2 hours.