works well using my thumb...though I didn't have the 5s before so not sure how it worked then
The 6 is my first experience with Touch ID and it's working flawlessly for me.
In terms of registration ... i think that was a lot faster... again this could be either an improved sensor or simply a faster encoding algorythm in the A8 making it process the data quicker
Definitely felt faster between touches registering my prints just now