Bought the pro kit and 3d printed parts. Read everything through, watched the vids and then installed. Couple hours to do everything, instructions generally good, but sometimes confusing.
NOTE: The thermocouple is very fragile, really take care during install and wire routing not to bend at the connection.
Been using it for 3 weeks,no BT scales yet as preordered the Themis Ultra. What I can say is this upgrade makes an ok espresso machine into an absolute gem. Can now pull everything from extra light through to dark espressos with the control I need.
Highly recommended, Whether you want absolute control, or just to download some of the excellent profiles created by others, you WILL get not just good, but great espresso.