One of the main, in fact I think the ONLY criticism of the HTC ONE M7 was of the power and the volume buttons. While it might seem a small issue, it did cause people quite a few issues, power button that stuck when pressed in, things like that. HTC went a long way to solving these issues on the M8, they felt more solid if that's the right word? And with the M9 the issue is fixed completely. How they should have been right from the start but at least It's good to see that HTC aswell as listening to the complaints and feedback, actually did something about it.