Well, I am still concerned about the quite big duplication of effort - with Nemo having to build the whole UI & core apps from the ground up, while there already is a working implementation working on the same hardware that even uses the very same middleware.

Also, the closed Sailfish UI layer has at the moment quite a lot of missing features & bugs, but there is no place to submit them & track progress and the source is not open, so community can't help with fixing them.

So these two are my main concern.