It is definitely an interesting idea. I've lived through failed promises of glucose readings contact lenses and watches, I'm not sure exactly why they fail but it's made me pessimistic about things like that. I think anything new will have a hard time competing with current cgms unless it can be worn continuously for a month and/or doesn't puncture the skin at all. For the type 1 market, patients already have to puncture the skin all the time to deliver insulin and most get used to it. The interstitial fluid measurement seems to be standard for cgms, so it's on par in that regard.