from my (limited) experience editing with these clips, it seems newer computers should be able to play back the clips ok (either just to view or in the timeline) but once you start making cuts they will stall or drop frames at the edits. my uneducated guess is that this has to do with the codec needing to reference the other frames and it gets confused when the next frame is from a totally different shot (because it uses p-frames). I'm not sure dvcpro hd should be considered that great a codec either though as it is not really a full sized hd (something like 960 x 720 for 720p and 1440 x 1080 for 1080p).