Having difficulty with the sensor of Medtronic 530 G

Does anyone currently use the Medtronic 530G w/ Enlite?
My daughter is 5yo and we have been using the pump for about 6 months. After about a months we tried the sensor and had quite a few problems with it (ex: false readings, not calibrating, false lows and the pump suspends).
I would love to try it again but do not want to deal with the frustrations of what we went through the first time around. I can actually sleep now, versus a week of sleepless nights of false readings and pump alarms.

Any advise or suggestions?