Fiscon Basic Plus is a great bit of kit - i have one in mine and it works perfectly with the MFA and RNS for telephone functionality.
You also get the EMFA add on with it so you can tell proper coolant temp, oil temp, revs, voltage, fuel level (exact) and a few other bits too plus boost pressure if its a diesel
Also allows for A2DP audio streaming
So yeah, all round a great bit of kit.