Medium quality is good for business shows, sometimes it is hard to tell the difference. Sports and anything else with a lot of movement really should be done at best quality. You are pretty much stuck with using medium quality if you want 4 hours (basic for 6 hours). You can only get just over 2 hours of a good quality movie on a regular store bought DVD (using single layer disks like DVD-R). I believe there are better compression techniques that retain quality (like DiVx?) but they require a lot more CPU power and the disks might not play on regular DVD players. Anyone with more expertise know more about this? Ian.