I guess that¡¯s the crux of my question¡is there any hard info on the processing power between the 3 series units? ?Anecdotally speaking I¡¯ve always thought that CP3/4 was about as snappy as it gets, with little if any difference stepping up to the AV/PRO units other than their obvious physical connections. ?In the last few years we¡¯ve gone almost entirely back to 3 Series as I can¡¯t remember the last time I have received a new 4 Series unit.?