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It’s usable for day to day operations to me (iPP 9.7 is a lot better) but that doesn’t mean that’s the case for everyone else. Performance is a little less than 10.3.2 but sluggish in other areas.

The added features and UI changes on the iPad is worth it, even if it’s not completely stable yet. Not sure how it’s running on the Air 2. Someone would have to chime in with that. If it runs well on it, I would go for it.
 
My iPad mini 4 is now unusable. Dropping back down to 10. Not worth it at this stage and I will gladly wait for stability.
 
I guess it depends how willing you are to put up with bugs and possible stability issues. I'm probably going to try it in one of the later betas, but it's too early for me yet.
What is the likelihood that the beta will mess up my iCloud data (photos, etc) if I update? I could live with bugs and instability on the device itself. Data corruption, etc, on the other hand, is a different matter.
 
on my 12.9 it's great; very few bugs and no deal breakers; it's perfectly usable and I'll stick with it. On my iPhone 7+ it is causing the photos app to hammer the battery in the background and I may drop back down if the first update doesn't fix it.
 
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