The -:
-Of Missing apps (soon to be released, including the cloud app Mega)
-The Weight is slightly higher than its competitors live.
-It Tends to heat quickly enough (after a long call or during / after using an app that takes a lot of resources).
-Cortana Is still being developed (still in beta), it is simply available in English and is still pretty basic (to follow its evolution with the MAJ)
In short, there is really very good. I recommend it.