Thinking I would like the larger size, I went from a iPhone 5s to an iPhone 6s Plus during its launch. It was a huge mistake.
I did enjoy the larger sized 6s Plus, but only when I could get two hands on it. One handed use was almost impossible, especially one-handed photos. I am average height and have large hands, but I could never comfortably use the iPhone one handed.
I also didn't like the rounded edges, the 6s Plus would sometimes "pop" out of my handed, especially when my hands were really dry. It almost felt like holding a wet bar of soap.
It wasn't just holding it which was a problem, but finding places to store the phone, such as pockets and while driving. I usually ended up putting the large phone on the passenger side seat, which was fine until I took a left turn too sharp, and then the phone went flying.
I really knew I had an issue when I started shopping for clothing and jackets, and pocket size ended up being a deciding factor.
I gave my old 5s to my wife to replace an iPhone that she broke the screen on, so I couldn't go back. I asked my wife if she wanted to swap, but she didn't even like holding my 6s Plus due to the size. It was kind of understandable for her, as she has tiny, child-like hands. So, I just put up with the 6s Plus.
After my wife cracked the screen of my old 5s, I got my wife the 2016 iPhone SE (and a defender case), but was a little envious of the size of her phone when handling it to put he case on. I considered getting one for myself, but at the time they had a max storage of 64GB, and I didn't want to half my storage.
As soon as the 128GB SE launched, I got it and sold my 6s Plus to a friend that really wanted an iPhone, but he didn't want to pay retail and didn't want a used phone from a stranger. He was very excited to get the iPhone 6s Plus, at least in the beginning.
He has the build of a basketball player, 6'6", very large hands, I figure holding it shouldn't be an issue for him, but shortly after he got it he started to complain about the size.
He ended up having many of the same complaints I had, although he really liked the design of the phone, while I always preferred squared edges.
He told me a few days ago that he preordered the 2020 SE.
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Oh yeah, going from the large iPhone 6s Plus to the SE did take some getting used to, especially for typing.
But I was never comfortable one handed typing on the 6s Plus anyways, so it wasn't to hard to adjust.
I still miss the two-handed use with the Plus size. I have a iPad Mini for when I want a bigger device.