The 7 touchid is much, much better than previous versions. Near instant

It's better, but it still sucks for me.

My 6 worked so infrequently that i stopped bothering. At least with my 7 it works about half the time on the first attempt or two. I've put my prints in many times, I've even recorded my thumb from all sorts of angles as multiple fingers. Still no joy.

I know people with very dry hands who have this problem. Maybe due to cracked skin?

Wet hands also cause problems, but wet beyond sweaty.

Blisters are another deal breaker. As a new golfer I've been feeling this. I imagine people who work with their hands all day (e.g. construction) may have a similar issue.

For me this happens ONLY when my fingers are wet or oily. Otherwise it works 100% of the time.

It works pretty well on my oneplus 3t, so it's not impossible to get right.