Hi, and please excuse the long post.
I've been using the Dexcom G6 since August last year on an NHS Scotland trial. You're right, it is a game changer but be warned: Dexcom are very slow at getting the apps up to date and this means that most iPhones carrying the latest iOS are incompatible. Having argued at length with Dexcom about this, they suggest buying either an old phone to use instead or using their transmitter at a cost of around £265 (which purely gives you a reading). Neither of these is a great option as the supposed beauty of this system is that can be used seamlessly with your phone.
I've continued to use my 'incompatible' phone and it's true, there are issues. The first being that when I was away from home the app failed and I was told to reinstall it. Of course I then had to put in my transmitter code which I could only get from the transmitter itself (not the sensor). Yes, it was attached to my body and had to be removed. The app also appears to lose contact with the sensor more often than before, resulting in it thinking you're hypo overnight and screaming at you, despite you being 5.6. You get my drift. Just thought I'd point this out. Still love Dexcom G6; just wish the developers were as quick to update as they are to take the money...