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I have 70 left. A lot of apps I could just delete, but I have them there because I don't need the space. I'd be at around 62GB if I downloaded the Apple Music tracks for offline listening. I had them, but they deleted themselves and I never bothered to redownload them. I think I cannot use much more than this. On my 128 iPhone 6s, I have 71 left, but with a 2-hour-1080p-60fps video that takes a little over 19GB.
 
Wife and I each have 128 capacity ipads and iphones. This capacity was selected to enable us to sync to each the great majority of our photos from our imac.

But syncing has been failing in varying degrees for at least 18 months despite many hours spent on the phone with Apple Care. So we have wasted a lot of money. My ipad currently has only 33gb used, with less than 2 of photos, and nearly 20 of music which I could live without.
 
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