Vlad Savov, in his review for The Verge of the HTC One Max, says about its fingerprint reader:
[I]t’s placed in exactly the wrong place. Sitting immediately below the camera lens and requiring a swipe, it pretty much compels you to smudge the lens every time you want to identify yourself. The need for a vertical swipe is also problematic, since your hand’s natural position is at an angle to the sensor, demanding an unnatural and uncomfortable motion to activate it. Inevitably, that leads to regular failures to recognize your epidermic signature.
Equally enervating is the fact that you have to wake the One max from sleep before swiping to unlock it. The whole point of these fingerprint sensors is to speed up security processes, not make them more finicky, and that’s exactly where the HTC One max fails. There’s plenty of potential here, as you can enroll up to three different fingers and assign each an app to launch, but that only works from the lock screen — why not universally? As it is, the fingerprint scanner implementation here is clumsy, awkward, and comfortably in line with the long history of failed attempts at making this technology work.
This section's header says it all: “Fingerprint frustration”.
Compare and contrast HTC’s implementation with how Apple’s did Touch ID on the iPhone 5S, and it’s clear that Apple’s way is vastly superior. Touch ID’s capabilities are purposely limited for now — only unlocking the phone and making iTunes/App Store/iBookstore purchases — but putting the sensor in the Home button, right on the front of the device, is the smart play. It also seems, technically speaking, that Apple’s sensor is better than whatever HTC is using. Seems like it’s similar to the scanners used in some Windows laptops.
Imagine had Apple put Touch ID where HTC’s is; it’d be a major shitshow.