that's absurd, I've never even heard of a fail rate that high for the S6. Almost everyone rated it the same or even better than the iphone 6, not sure how it compares to the 6s, but it should never have been anywhere near 50% fail rate.
Hell I think on my note5 my fail rate has to be somewhere in the sub 5% range, it rarely if ever happens to me...
Is your note brand new? How can you say that my experience is absurd - are you an engineer that knows, for sure, that the note 5 has the exact same hardware scanner? At first the scanner worked pretty spot on, it got progressively worse through time. By fail rate I mean the scan wouldn't register, I'd lift up and have to do it a second time. What's REALLY frustrating is that sometime's I'd scan and then the phone would go to sleep instead of unlocking.
Also, it's possible that some of my my problems are due to 1st run bugs, but this is what rubs me very wrong. With iPhones of the past I've been able to walk into a store, talk about my problem and, even If the problem couldn't be demonstrated they'd err on the side of caution and replace my phone so that I'd at least know it was a problem with that particular unit. Not so with samsung - 'your battery life is within our acceptable range and reception issues carrier related" = no rma authorized.. I felt like I had zero support, which is not what I expect for a $700+ phone