I have just recently been seeing advertisements about this product. What are the advantages to it and the disadvantages? I have adjusted my tv with the video essentials dvd will this product allow me to delve deeper into the settings and produce a better picture overall? I just want to know if it is worth the money or am I better off saving the money and having my tv proffensionally calibrated? I know there are a lot of question's but I have not seen any info on this product from actual users that I respect. By the way I have a 51" Sony rear projection tv.