I've used both the libre and the dexcom. I gave up on the libre because the accuracy was just so hit and miss, and I also wanted the low/high alarms without having to scan - I do a lot of lab work, and so by the time I've taken my gloves off and washed my hands to scan, I might as well just have done a finger prick. Generally, I find the dexcom to be a lot more accurate, although it too is subject to compression lows, like the libre. The 'follow' option has also been wonderful for me - boyfriend has the follow app on his phone, so if I'm having a hypo and it isn't coming up he gets an alert and can check on me. The dexcom is more expensive than the libre, primarily because of the transmitter, but although they advertise the sensor as being only for a week, I normally get 2 - 3 weeks out of mine. In terms of insertion, the libre is definitely easier, as the dexcom can be a bit of a fiddle, but for me the dexcom seems to stay down better, although that seems to vary from person to person. Also, it seems to me as though the dexcom isn't *quite* as far behind as the libre, though that could just be my interpretation.