What are the few things you can't/don't use your M8 for because of its "small" screen? I have the original One, with its 4.7" screen, and have never seen the need for more than that. I only see it as cumbersome. The One is still cumbersome at times as it is, but has its benefits. I think that around 5" is the maximum sweet spot of cost/benefit from a usability standpoint though.
Then again, I have never seen the need for tablets in general. My phone is perfect for everything on the go, and if I want to use a larger device for more complex/power tasks, my ultrabook does a much better job than a tablet/phablet on every front.
Then again, I have never seen the need for tablets in general. My phone is perfect for everything on the go, and if I want to use a larger device for more complex/power tasks, my ultrabook does a much better job than a tablet/phablet on every front.