Have you tried to use it with xDrip plus[1] and an NFC capable Android phone? It allows you to calibrate the values using accurate blood glucose values. If you do a bit of research and do the calibrations right, it can be as accurate as the values from a fingerstrip reader.
Being a type 1 diabetic, this software has changed my life totally. It's just that good nothing else comes even close. I use Dexcom G4 as my CGM and I wrote an InfluxDB support to xDrip, so now I can use Grafana to monitor my glucose values in real time.
The development of xDrip plus is very active, so you probably want to use the nightlies.
[1] https://github.com/NightscoutFoundation/xDrip