With PowerDVD, I had breathtaking rewinds and fast forwards. As good as I have ever seen on any system. Now with Windows 7, I love not having to install extra junk software, but the higher speed seeking is not as flawless. I like 5 fps updating of where you are.
Correct me if I'm wrong but I think the way TiVo works in this area is a big goal. Just try its seeking. DVD players are terrible (Blu ray is worse). HDDs help a lot.