The DTV guys set up 7.1 surround in my living room and 5.1 surround in my basement.
In this case, I had already procured most of the materials I needed (Klipsch in-wall speakers, mounts, displays, and cabling). Though I did get a nice center speaker from DTV.
They guys came out and did a solid job that has not had any problems. I recently replaced one of the displays (myself) with a larger 4K model and I was able to leverage their installation with no problems. I recommend them without reservation.