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I just installed the beta 5 on my iPad Air 2 and the first impressions are very positive.

I hadn't installed any other beta before, so I waited till things become stable...

I love split screen multitasking already. Being able to minimize videos and pin them on the screen is also great. I now feel I could replace my laptop with my iPad (for my light laptop usage that I need). Of course my iMac will still be my main computer..

Another thing that I really like is the new keyboard.

Does YouTube video in a window work now?
 
got it installed, it's way snappier than the previous one. actually, it's almost OK for me, just a couple of lagginess here and there but way better than iOS 7 and 8
 
Some screenshots of the iCloud Drive app/settings:

Photo 06-08-15 20 41 43.png Photo 06-08-15 20 41 51.png Photo 06-08-15 20 44 30.png
 
Has anyone else noticed that their iCloud backup is significantly larger since joining the public beta? Mine about doubled in size for some reason. When I look at the contents (i.e. messages, photos, etc.) they come nowhere close to the size of the backup.

I think it's because you have an old iOS 8 backup and a new iOS 9 backup. Could that be it?
 
I'm pleased to say that the typing issues that I experienced with PB2 in the Mail app on my iPad Mini (1st Gen) and my Logitech keyboard seem to have vanished with PB3. I used to get awful lag between typing and display using the mail app and after a pause in typing, the first character would repeat itself. It rendered the Mail app unusable. Thankfully this has been fixed :)
 
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