Yes I switched to the hybrid loop as soon as I could.
I’m not sure what the MARD is to be honest. My trainer mentioned something about MARD in passing, but I can’t really recall what it was now. I got the impression they were more focussed on TIR.
Personally I’ve found the Simpleras track really well for me, especially 4-10. I have found some sensors had a tendency to over-read lower levels, and under-read higher levels, which needed a bit of calibration shenanigans, but have needed to calibrate other sensors hardly at all.
I’ve had, I think, 2 occasions in the mid-3s where the Simplera hadn’t quite caught up with reality and was still showing mid 4s, but the good news (for me) is that Smartguard is much more effective at reducing drifts into the 3s, so my warning signs are heightened.
As with all sensors, there’s going to be a bit of lag, and some frustrating situations where being told what was happening 5-10 minutes ago really isn’t ideal - but that’s the same whichever you use. I had just the same with Dexcom which has the reputation for being The One.
I always try to let the algorithm ‘do its thing’ for a month or so, and then see what options / changes I may need to make in the information I provide and in the settings to fine tune it to me. I’ve shortened my insulin acting time for example. I think pharmacologically it’s about 4-5 hours for NovoRapid, the Rep suggested 2-3hrs, I started at 3hrs, but have dropped it to 2.5. Which means the algorithm thinks I have less insulin active than I possibly do in reality, and is more able to correct higher levels earlier.
The system is currently working very well for me indeed, with TIR improvements over the tSlim, and a lower incidence of mild hypos. My consumption of Skittles and full sugar coke has reduced - because the Medtronic algorithm acts a little more firmly, and a little earlier (at both ends).
It has become clear that the system does need to know about all carbs eaten. And adding ‘fake carbs’ for a correction is, I think, less effective than letting the system add it’s own correction boluses. I can always briskly walk around the block to help kickstart autocorrections if need be.
If you are worried about the lack of bolus overrides, perhaps you!d prefer the Tandem tSlim and Dexcom? That allows you to add corrections in, and bases its adjustments on the Basal / Carb ratio / Sensitivity profile you set up - meaning you have more levers to pull in terms of tweaking the way the algorithm works.
Personally I am enjoying the handing-over of quite a bit of that brain space. I’m thinking less about my diabetes day to day, and my results are at least as good, if not better.
Monthly stats suggest 92% 4-10, with only 1% below 4.0 and nothing below 3.0.