I've been using the binding for a while now!
must say that i still have some problems with auto discovery, but manually adding the sensors work fine!
I encountered a bug in 1 for the components.
The GAS meter should contain a variable for V_VOLUME but in the logs i'm getting errors that the variable does not exist.
i searched in the code and found out the the class for SGAS is not containing the V_VOLUME variable.
github link: https://github.com/tobof/openhab2-addons/blob/MySensors_Binding/addons/binding/org.openhab.binding.mysensors/src/main/java/org/openhab/binding/mysensors/internal/sensors/child/MySensorsChildSGas.java
as by: https://www.mysensors.org/download/serial_api_20#sensor-types SGAS should also include a V_VOLUME variable as wel as a V_FLOW
For now i adjusted my sensor to use one of the custom var fields. but it would be nice to use the V_VOLUME variable for this.