I did a clean install on my wifes 4th Gen Ipad (first with lightnight port). She isn't really a Techy, and keeps saying her iphone 5s is good enough (so you can get a little background). The first thing she said was "it runs much much slower". Now, she is not a fanboy, and basically takes my hand-me-downs, so she is the average user. That is about as typical a response as I have seen by non-apple fanboys. I try to keep up with the newest iphone/ipad, but have decided to go every other year (I have an air that I will replace with the pro, and a 6+ that I will replace with the 7+). So please to not group with the haters group. I just want apple to under promise, and over deliver, instead of the other way around.
I keeps starting out with x.0 versions working beautifully on the latest device, while very laggy on older, then they spend months trying to resolve issues on the older devices. My 6+ which I got on launch day last year should not run any worse on this initial OS, I get it with 5s and before, but last years model, really?