here are some discussions on the 530
http://www.tudiabetes.org/group/minimedparadigmusers/forum/topics/medtronic-530g-with-sensor
https://forum.tudiabetes.org/topics/medtronic-announces-approval-of-minimed-530g-with-enlite
https://forum.tudiabetes.org/topics/dexcom-g4-vs-cgm-in-medtronic-minimed-530g
feel free to add to them if you'd like