Windows Forum Team
No searchui running here. I also removed all MS metro except weather(disable live tile and all ports close when you close it) so my machine has become less chatty to MS. I realize a future update I might be back to square 1 but will deal with that when it happens cause you can't stop the background updates bypassing firewall rules but guess what, many many out there working on getting rid of these things.
Turning the searchui service off would slow down your network... wifi in particular won't like this and may drop you out of the domain at boot time until the tool times out looking for it.
Its your system mate but be aware of the down side.