After reading Andrew's article the other day, I searched a bit for the KeyOne. Looks good, except for one big thing - the battery can't be replaced. I'm not a big smart-phone user, so the one I have (my first!), a Samsung S4, is what I'm still using. I wouldn't be using it if I couldn't have replaced the battery when it was dying. I'll spend money on a new phone at some point, but I don't want to be doing it every 2 or 3 years just because the battery dies!
And yes, I do realize I'm not the target demographic.