This thread is interesting. From the beginning I've used big screens. My first candy bar touch screen smartphone was 4.3 inch, followed by 4.5 inch, 5.0 inch and now 5.5 inch with my iPhone 6s plus. So for those who owned devices with 3.5 inch to 4 inch devices in the past, might know how it is to move from 5.5 inch to 4 inch. But, for me it might be like heaven and earth.
Anyways I do respect OPs decision, because it was his taste and preference. I have seen most of the people in this thread have complained about the portability issue and single handed usage. I know single handed usage is not possible in a 6S+ although double tap on the home screen helps, its just that most of us are not used to it.
But I have never faced any portability issue. I am 6'1 and I never wear tight jeans or trouser. So 6S+ perfectly suits in my pocket with the case. Seriously I don't think portability should be an issue with the 6S+, unless a gurl is placing it in the back pocket of her tight jeans.