Yes. Yes.
Mine feels slower, but more importantly things no longer work as they should. All the browsers I use crash. Text entry is squashed into a few pixels. Apps interfere with the homescreen in odd ways. All in all it feels very unfinished and very un-apple.
I’ve been an iPhone fan since first buying a 3 of STW years ago. Had a string of other smart phones before, but just never found one I was happy with. Then got the 3 and everything just felt right. Upgraded through a 4 and now a 4s. Was perfectly happy till iOS 8, and now 9. I feel like apple has taken their eye off the ball. Not sure if the os would be better on more up to date hardware, but I think not. First time in years I’m thinking of jumping ship!
Oh, I’d just add that the OH has the same phone and stayed on iOS 7. when I use it, everything is all right with the world.