To answer your first question I have been a devoted Dexcom user for 10 months but have just started to use the Libre/Nightrider/xDrip+ combination and am currently wearing both.
Just starting my second Libre sensor and I believe for me in the UK this is the financially the best solution as I may be able to get the sensors free from our National Health Service.
I note that many people are not totally happy with the Libre sensor but my first one has been very accurate much more so than the Dexcom that I am wearing at the same time, which I have to re-calibrate twice a day.
What is more the Bluecon Nightrider enables you to re-calibrate if the information from the Libre is way out from the fingerstick test. I am using the Contour Next for my fingerstick tests because in a couple of surveys this came out as the most accurate with a within 5% accuracy rate (both Dexcom and Libre) were about 12%).
After 35 years of being on insulin without many problems there were a couple of occasions where I needed assistance from paramedics 10 months ago so I am only interested in systems with alarms.
So my initial impression of the Nightrider is that it is just as good as the Dexcom although I find the screen a bit over the top very smart and colourful but I was pleased when I found I could switch off the lines predicting where your BG is going. The Dexcom is a very simple and clear read.
The big advantage that I understand Nightrider has over Dexcom and Libre is that for carers they can follow the blood glucose readings in real time - so if thir child’s BG is low and falling they do not see it in 3 hours time as with Dexcom but right now. However I have not progressed to the stage where I can see this.
Still very much a work in progress.
The main problem with Bluecon is that mine took six or seven weeks to be dispatched and reach me in the UK with minimal feedback from Ambrosia.