Great codec pack, offering support for every file I've ever wished to use. Easy to install, easy to uninstall - which you should do when you install newer versions, and I've had no problems with spyware.
It (the Jan and Feb builds) caused a strange bug with my Office Assistant in Off XP(it couldn't close without a BIG BAD WARNING WINDOW). Has this been solved??? Reverting to 20041012 solved the problem.. But..?