@DibbleS and
@Bluetit1802 - I am watching developments on the Abbott gizmo for a while, then I may "invest" to track myself periodically.
I understand it's now on sale, at (if I recall) about £180 for the reader and 2 sensors - so set up for a month, although that apparently includes VAT which of course, we can probably recover.
I'm struggling with whether my healthy interest and love of data and knowledge is teetering over into obsession. I'll keep watching for a while and see what post-launch feedback is like.