I've now tried two (2) Costar units and both had the same challenges: 1) On our Vizio L37HDTV ~10% of the screen was off the edges. No matter what we tried nothing fixed it 2) No sound. Running an HDMI cable from the CS to the TV HDMI no sound. Plug my Roku in and all works fine (normal picture and full sound) 3) Tried getting the CS to work on a Hiteker (BestBuy) 32" which is new. The CS wasn't recognized and wouldn't go through the setup process. (The Roku worked just fine) Spent a total of over 2 hours on the phone with Vizion tech (they were courteous and made every effort to help). To get a replacement unit I had to give them my CC# for expedited turnaround (which included a UPS label for the return of the first unit). When the 2nd unit didn't work they were going to make me pay for return and a 10% restocking fee. I refused, the tech talked with a supervisor and they are submitting for a refund without either charge. For whatever reason the CS just didn't work for me so I'll stick with the Roku.