Well, you’ve already seen some of the anti-670 responses, not necessarily from people who’ve actually used it, so there are a lot of opinions out there, pretty polarized.
I have used it, gave it a good 4-months’ effort, and while I got it more or less doing what it’s supposed to most of the time, I never did as well on it as I had done with my pre-670 regimen, so I went back to that. From my experience I would concur with @Terry4: there are people who are absolutely thrilled with it, but they tend to be people who are struggling to get into the low-sevens or high sixes. I was running about 6.5 on it by the end, but I had been doing 6.0-6.2 for years before that, so that was actually pretty frustrating. Beyond that, there are some technical issues people complain about, particularly something called the “calibration loop,” though that seems to have been solved in their latest transmitter update.
AFAIK there is still no Medt feature analogous to Dexcom Share, which you’re relying on. In theory, the 670 would make up for that by eliminating the overnight lows that are the scariest problem for parents. I would say that it can do that—at least, that’s one of the things people who love it talk about. But if you have a small child it may not make up for the psychological security of having Share on your bedside table.
Definitely more hands-off, yes, and that’s again something people who do love it say—that they’re spending a lot less time thinking about their T1. In my case I never got to that point. It always seemed to be demanding attention about something and I was struggling to get it to correct my highs adequately and the like. Also, just to be clear, it’s not adjusting basal rates as such, really it kind of does away with that concept. Instead of a fixed number of units per hour, it’s continuously adjusting “microbolus” doses, each calculated to bring you to a target BG level (120). So there’s no set “rate” as such. It’s a much closer approximation of what a real pancreas does. Getting used to all the ways that makes a difference took me a while—it takes some mental readjustment. Of course that’s going to be true for any of the looping systems that are coming online, not just Medt’s.
Bottom line for me: If I had it to do over I would have gone with the Tandem X2. Main thing for me is not just that the Tandem is Dexcom compatible—I was using Dexcom before I tried the 670 and have since gone back to it, recently upgrading to the G6 which I’m finding fantastically accurate—but the remote update capability. I think it’s absurd, bordering on obscene, that we have had to commit to a pump for 4 years and can’t access any improvements and advancements on the software side. Imagine having to replace your whole computer every time there’s an operating system update. It’s ridiculous, and Tandem so far is the only system smart enough to recognize that fact. Whereas if Medt fixes the problems that a lot of people have complained about—for instance, making the target BG adjustable or giving you more ways to fine-tune it—you won’t be able to get any of that stuff for years if you aren’t eligible for a replacement pump.
ETA: I would also say that the Guardian sensor system takes some getting used to if you’re used to Dexcom. There’s a lot of fussy taping, it’s harder to extend sensor sessions, and that whole part of the change was something I never grew reconciled to. The sensors were about the same accuracy as the Dexcom G5 (I wore both for a while, just to see), but there are other things about the system that have a higher annoyance factor.
