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Regarding the Air 2, iOS 11 has not slowed mine down. I see an occasional stutter on opening an app but overall I don't see any performance degradation. I have a 128GB LTE with about 19GB free.

Since this post, I installed 11.1 Beta and most of the stutter has gone away. Performance is very, very good.
 
For me itIs extremely SLOW
The problem is Apple forces you to install. I guess when you can no longer innovate you just make your products obsolete so people are forced to buy another one

I beg to differ. Nobody ever forced me to install anything on my iPad. We have an Air 2 in our household which seems to run just fine with iOS 11 and we enjoy it.
 
Why don't you roll back to 10?

I rolled back to 10.3.3 the other day for my ipad air 2. Best decision I made. I found ios 11 to be slow and clunky. I thought the dock for multitasking was terrible. I doesn't fully make sense which apps can be put in split view and which can't. Also the recently used app section in the dock is unnecessary.
 
I rolled back to 10.3.3 the other day for my ipad air 2. Best decision I made. I found ios 11 to be slow and clunky. I thought the dock for multitasking was terrible. I doesn't fully make sense which apps can be put in split view and which can't. Also the recently used app section in the dock is unnecessary.

Yeah, I turned the recently-used-app dock display off.
 
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