Bit the bullet today and bought the new Premiere 4 to replace my Premiere XL. Does anyone here have the Premiere 4 and can comment on performance of the new 4 tuner box, like responsiveness, sluggishness, or any issues with recording 4 shows at once, as compared with the less hungry 2 tuner Premiere XL? An XL4 would be ideal, but the up front cost is too much right now and I figure that I can always replace the hard drive or add an external at a later date if storage becomes an issue. As far as the Premiere 4 not having THX certification, will I notice any degradation of audio or video as compared to what I am used to with the Premiere XL? The audio and video of the XL, by the way, is vastly superior to my cable company issued "high end" DVR that I had before. Is there any truth that the THX certified TiVos run 7.1 and the non-THX units run 5.1? I have only a 5.1 setup right now anyway, but if the THX boxes can output 7.1 then that would be something to consider as far as future proofing goes. One last question. The Premiere 4 is only compatible with digital channels. Am I going to lose any channels in the Comcast Boston area or is the system 100% digital now? Any and all comments are welcomed and appreciated and thank you in advance for all responses.