The tales I heard about the install are either great or horrible. Mine went fine... at sign-up time they suggested I let them install on a Saturday. The installer called to say he would be an hour late, then spent two hours hooking up receivers on opposite sides of the house.
About the only warning I would give is to ensure your rigs are near phone jacks. Otherwise, have an extension cable on-hand. In my family room, the TV was about 30 feet (around the walls) from the phone jack. As their 'free limit' is 20ft, the joker wanted to hit me up $30+ for a 10 foot longer run of phone cable. Told him 'nyet'.