We use our pump in a very flexible manner through many different modes of operation and activities, sports or otherwise. Having great in great detail as much about the experience of new adopters, I feel that (a) nights would be better for us by a large margin, but (b) there is a lot we do today that we would not be able to do with the 670G, and (c) my control engineering background tells me that the 670G cannot deal with peaks.
Essentially, the strength of the 670G is to control small variations around a constant or slowly varying basal. That’s what its algorithm is good for. A night without a strong hormone peak is perfect ground for the 670G (although I am not sure that it will deal well with repeating phenoms such as dawn phenomenon)—the rest of the day won’t work well for us.