Greetings from a Russian user of Teclast K3SE.
1. I have not compared the device to Kindle yet, but can definitely say the screen is not Pearl. It is an ordinary Vizplex showing 8 shades of gray. Very readable, IMHO.
2. Have not charged it yet, been using it for 2 weeks already.
3. Russian firmware for Teclast K3SE is here:
http://ygrig.front.ru/teclast/. I plan to keep this firmware up to date with later firmware releases from Teclast.