Dexcom G5 Mobile

Usually within a week-you can track each stage of the parcels journey.
I got skintac (about £23) and a roll of rock tape h2o (about £13) in addition to the dexcom sensor and transmitter.
I use my mobile as the receiver but use xDrip+ rather than official dexcom app. Think the dexcom app limits the life of the grey transmitter to just over 3 months and causes it to switch off. xDrip+ overrides this so it keeps going until the battery actually dies.
The official line is that a sensor should be replaced after 7 days (so about £200 a month) but I keep mine on 30 days, saving £150.
I love my G5, wouldn't be without it!

We use G4 for my 6 year old daughter, so same sensors. We get 2-4 weeks from each sensor. Dexcom are very easy to deal with and delivery is only a couple of days.

I have no experience of the G5. However, I have trialled the G4. As with the comments on this thread, many people are able to "restart" the G4 sensor after the designated 7 days.
I have tried putting mine in many places - stomach, back, arm, ... it is definitely possible to restart it and getting it working for more than the 7 days. However, it has not lasted more than 10 days for me. This is due to the area around the sensor getting "distressed". I don't know why I am more "distressing" than other people but had similar problems with the Libre and have to change my pump after two days otherwise the itchiness gets too much. I always use SkinTac to reduce this (an additional cost).
I may just be more sensitive or it could be that I have little fat or that I am constantly moving and exercising which means, wherever I put the sensor, it moves around a lot.
That said, the extra input you get from a CGM is wonderful.
Just don't do your budgeting based on 30 days per sensor: you may be disappointed.