I'm scaling down to a 6s from a 6 plus. I'm going to miss the battery life, but if it lasts the same time as my watch, then that's ok, as I charge that every night anyway, so might just get myself a dock so they can sit side by side. I have a great nightstand for the AWatch from Orzly.
Sold my plus two weeks ago and since then I've been using a loaned 6 until my 6s+ turns up. Really struggled with losing the screen real estate a lot more than I thought I would. Hope you had no regrets down sizing.