Hi Emila,
Am also a Tandem user, couple of downsides - the tubing, but that's really a minor niggle when compared to the benefits and adjusting pump for exercise, I still cannot fully crack evening exercise on the pump without going hypo. mornings are find due to insulin resistance. If used with the Dexcom CGM then it becomes a closed loop system as the G6 communicates with the pump via Control IQ and makes minor basal adjustments, I rarely if ever, get a hypo during sleep and if going low my pumps auto suspends insulin until levels come back into range, I simply input carbs for meals and the pump does the rest, lots of adjustments required to settle in and get ratios right and even then as with any diabetic our needs change over time so it's always something to be mindful of, but all in all, a fantastic system.