A hackable and stylish clock
For Agora clock
The clock was shipped and arrived quite promptly (for international shipping); already showing correct time ;)
On the outside, I find it very stylish and minimalistic. It really stands out among the "DIY clock"-type things - it feels really "polished and finished". The functionality is as descibed, no unneeded fancy features. "Just works." The display is crisp and very readable - it is e-paper after all, like a Kindle.
With a couple of button presses there is an info screen which shows battery status and uptime. The claim of battery longevity seems to hold up: I've had the clock on for 3 weeks and the charge is still 99%.
I've opened the clock (needs a small allen key), and the circuit and wiring is of good quality and good design. (It simply uses a 32768Hz quartz crystal routed to the main atmega328p MCU to keep track of time, there is no RTC.) The schematic and firmware sources are available through author's website; the standard AVR 6-pin ISP header is already soldered on the PCB. So potential firmware updating does require external hardware (AVR ISP programmer with 3.3V signals), it is pretty standard and well documented (one can also use an Arduino to do this in a pinch). The version of firmware that was shipped with my clock is pretty good and "feature complete" however, so no real need for this.
Overall, this is an awesome clock for both actual use and "avr-hacking".