Gen 4 vs dex 7 - opinions anyone?

Jesse , 20- has been wearing both for the last 2 weeks... He has another few weeks in a victoza/type 1 clinical trial and has to use the older version for it...... then he got the new G4 and he just HAD to wear it... Said the new one is so much more accurate...
and to think it took me so long to get to wear the first one...
by the way ,6 weeks into the victoza study his A1c dropped from 7.2 to 6.2. It's a great accompaniment to insulin.... he no longer eats 24/7..Lost 10 lbs, not that he was fat...and is using 50-60U insulin instead of 100 a day... ( he's 6'5 ) and his BS rarely spikes... 1 hrs after thanksgiving feast he was99..... 2 hrs- 113 4 hrs 100...6 hrs 100
he's loving it and hope its approved or he'll have to use it of label..