At the beginning of September I decided to get a new set, the 36XBR450. Well the first set had uneven black level from the left to right side. This should have been fixed in the 450 from what I have read. I played with the SBRT in the service menu and could not fix the problem. Hifi Buys decided to just replace the set. Well the second set was delivered in the beginning of October and it had problems as well. At first the only thing that I saw was a mild purity problem in the lower left corner. The black level was ok on this one. After about three weeks, the set developed a horizontal hum bar the rose through the picture. First thing I thought was that another piece of equipment or ground loop was the problem. I spent my free time over the next couple of weeks checking my home wiring and possible equipment interference. Everything pointed back to the set. I finally had time to call for a service appointment. The technician came out yesterday to take a look. We took loose all connections to the set and hooked up a self powered signal generator. He saw the problem and commented that this was a first for him. He got in touch with my salesman and they have decided to send another set. It will be delivered Saturday. Please say this will be the last. I have to give props to Hifi Buys for their service and understanding. This is why I buy from an Audio Video specialty store. Overall, I love this set. It fits my needs perfectly. Everything looks beatiful that I feed it, except Dish. Wish me luck on the third.