Yes, so start up cost is over £100. I appreciate renewal of the sensors is about £50 per go, but to start up from the beginning is £138. I know, as I've just paid out the sum to get my first Libre.....
Based on a number of comparisons I've seen, the dex and Libre are apparently comparable for accuracy and the Libre has a better algo for providing a trace. The dex has the extendable sensors though most people struggle to get more than 14 days.