Hi Tim2000s... if you consider "libre" works in past way (past information), it only works 16 hours per day (when you sleep, it doesn´t work...), it lasts 14 days, but I think 90% dexcom users get 2 to 4 weeks (personally I always get 2 weeks, some 3, but I always replace it in 2 weeks)... really it´s "expensive" with you get.
dexcom could be release a LOW COST system: get a old seven plus system, and disable alarms. You get extacly a "libre", but in fact, better (read is automated).
I don´t understand, in 2015 you have to "read manually". It´s more comfortable than strips, of course, but no big advance, at least, to me. I´m absolutely dependant to my dexcom, a "libre" device to me it´s starting to use a FAX, instead a e-mail.
I hope next "libre" will be released with alarms and automated read (it´s very easy... a wireless NFC device programmed to read every minute and transmit to receiver).
I like abbott navigator 2, seems a real alternative... but "libre", I don´t understand, really. But sometimes it isn´t necesary a good product, only a good marketing. In Spain, abbott libre is announced in national magazines and newspaper... dexcom never was announced. Doctors now know "libre" and think it´s good because a lot don´t know dexcom (from 8-9 years it´s selling). A lot $$$ to doctors recommending "libre", even being a worse product.
Regards (and sorry for my bad english¡¡¡)
PS: of course, this is a very personal opinion