@cehunt57 ,
It’s my understanding that most pumps deliver a constant basal insulin. Most use fast acting like Novolog. The amount of the basal in Manual mode on my Medtronic 670 is preset by the user and their doctor, based on their particular needs. In Auto mode, which I prefer, there is no preset amount of basal. The pump, calculates how much basal I should be getting to keep me in a good range…70-120. It’ll back off the basal, if I start going low. I manually insert my carbs in order to bolus before meals and snacks.

The difference with 780 in auto or Smart Guard mode is that not only does it provide the basal you need without using a pre-programmed amount, but it gives you micro boluses in order to cover your carbs, say if you forget to bolus or you underestimate the carbs. I’ve read awesome results from users. I hope I can do nearly as well.

I didn’t realize Dexcom had independent micro boluses. If it’s working for you that’s great. Everyone responds to treatments in different ways.

I’ll wear my cgm on my arms, because my cgm works better there and I’ll need my torso for my infusions. My infusions don’t work well on my lower stomach. I think I gave too many injections there when I was MDI. I get poor absorption there now. ☹️ I regret not varying my injection locations more for all those years. I now have used my back and sides for infusion locations. I rotate pretty well now I think.