I know I could try it myself but thought it was only for developers right now. So will it really change the way the iPad is used or only time will tell ?
I tried it. It's great. Even rather stable. It WILL improve your experience, but it's good the way it is now with 10, and it's probably a good idea to wait a while.
Thing is, 11 is stable now, so that's odd, it being so early. This is good.
Don't ask what iOS 11 can do for your iPad Pro... ask what your iPad Pro can do with iOS 11.... and with larger screens*, ProMotion, True Tone, 4GB, fast charging, A10X and better cameras.... it can do a lot on iOS 11.
I had iOS 11 on mine for a couple of days but today I reverted back. Although "stable" it's still full of bugs, which is to be expected, and I'll wait until beta 2 and give it another go.
That being said, iOS 11 on the iPad is definitely a great step forward.