I have really enjoyed the additional information I got from the Libre, but already had a handle on what my bloods did and didn't do before I invested. It's great to track all that unseen stuff you could never capture on the finger prick tests.
Like Slip, my only concern would be the potential for information overload.
I guess it's up to you whether you guys dive straight with the Libre, or get the basics of understanding the numbers, then move on. Only you guys can make that choice.
On the selling the reader point, I'm not sure how well that would work, in reality. Over time, the reader builds up some past history which I don't believe is wipeable. Over time, of course, the memory fill up and data is lost from the longer history, but that doesn't happen if you just don't use it, I think it's just on volume of readings.
As I understand it, if you were to sell the reader, someone would have a history of all your wife's data to work out through the meter, and that would potentially skew some of the longer term graphs and reports the software generates. Of course, the new owner could just run very short term reports, until their data builds up.
If the reader expires fr whatever reason, during the the warranty period, I'm pretty certain Abbott would replace it, free of charge, unless it had been killed by some accidental event; like getting it wet or somehow crushing it.
Sorry about the length of this jaoker, but it's great you and your wife are looking to achieve more prompt feedback on here progress, than the periodic HbA1cs can give.
Good luck with it all.