I like trying new things so added BME250 sensors to the SHC1 controllers to see if I could. This adds the ability to sense temp, pressure and humidity (and allows for automatic control of dew heaters, temp-adjusted focusing, etc). In retrospect, this would've been the easier route to upgrading, rather than new handsets but hindsight is 20/20
They now have exactly the same functionality as the SCH2 controllers, with a bigger battery and the centre button is also a joystick (not present on the SCH2+).
All controllers are also wireless.