this is a good router, imo. i bought it 2 months back, very happy. strength and coverage very good for 2 storey house incl all corners.

.. direct replacement of the unifi router, nothing else.
.. put the cables back same way - one of the ports is for hypptv, can't use others.
.. u need to call unifi to get password - this not the same one as yr wifi password.
.. installation, watch this video first:
https://www.youtube.com/watch?v=Y7VUBSFy_es
.. if buying at shop, the guy there can pre-install everything for u incl password if u hv it.

not so difficult to install. enjoy more stable and stronger signals.