I am a T2D who made the switch from Tandem’s Basal IQ to their new closed loop Control IQ technology on the t:Slim X2. Abbreviations: Control IQ = CIQ, t:Slim X2 = X2. First, for as much as possible, use the online training from Tandem itself. Tandem’s training is professionally done and screen shots appear to be either well done zoomed in camera shots or computer grabs from the actual software. There are no fumbles with video chat and a tablet or phone.
Second, turn on and use the Dexcom Clarity and Share features. This will allow you to follow the BG tracing in near real time. Remember the Dex CGM is every 5 minutes. My family and clinic follow me and alert me to wild swings. As far as the sensors go, the Dexcom G6 sensors are GREAT! I have used G6 for more than a year and have only had two sensors that did not last the full 240 hours (10 days). I called Tandem on one failure and straight to Dexcom on the other. I had a replacement sensor delivered by FedEx overnight.
Mobile t:connect has not been released, YET. It is coming according to Tandem. Details pending.
The biggest hurdles will be 1) learning new vocabulary (you already know about how long insulin lasts in your teen’s body, the ratio/relationship of carbs to insulin, placing insertion sets, how to insert a CGM, etc) 2) learning mechanics of X2, 3) learning alarms on X2, etc. You are changing from a pickup truck to a fine sports car.
Remember to get a receiver for the CGM if there is any place your teen will go (must know when CGM sensor is changed) where she will not be able to take her phone. Some places where you might expect a push back and need to handle a NO PHONE ALLOWED are 1) ACT/SAT testing, 2) called to a court room, 3) certain Gov’t Offices, etc.
You and your teen have made a great choice switching. Learning new terminology is learning curve.