I'm T2 and just seen an advert for the libre system. I'm wondering if this is as good and convenient as it looks?
How long do the patches last?
Does it have to be on the arms?
Are there any downsides?
For most people who try it (mostly Type 1) it works well. Some people find various problems (allergic reactions to the glue being an obvious one, but some people find it's just not accurate (compared to test strips) enough to be useful). Each sensor lasts 14 days, and it's only approved for use on the arm.
The main downside is the cost. (It's available on prescription, but it's not trivial to get.)
Less commonly, if you needed an MRI or something then the sensor would have to go first. (A sensor can't be reattached. Well, I think some people have succeeded, but it doesn't look like something a sane person would rely on.)
I think it's primarily of benefit for people who'd otherwise be testing many times a day, so if you have T2 and are controlling that effectively (with diet and maybe some medication), so testing once in a while, then using Libre is likely not worth it.
(If I were King for a day I think I might offer a Libre sensor to everyone with diabetes now and again (having two weeks of graphs would surely be of enormous value during consultations). And checking to see what different foods do to your BG is surely much easier if you can see a graph (rather than just a couple of blood tests). Those feel like they'd be worth the money, though maybe the patient training required would be too high.)