I recently purchased the 550 and have been very pleased with it. I am currently using it with my Phillips TV which I plan to upgrade soon, possibly to a Sony. The 550 was a huge improvement over my TV speakers. It was very easy to hook up, plug everything into the 550 receiver, 1 HDMI to the TV and I also hooked up the digital output from the TV back to the 550 receiver. It automatically mutes the Phillips TV when I turn on the soundbar. I used the settings from the 550 thread, to set the bass, treble, etc. I made sure the DirecTv box and the Blu-Ray were outputing digital signals and eveything sounds great. The wireless sub is easy to use and can be put anywhere. I am very happy with the 550 and would recommend it.
I had to do my settings through the 550 receiver display. I know some models of Sony TV's will allow you to show the settings on screen so they are probably easier to set up.