Onepieces pack is as close or closer then you'll get from a slipstreamer, or from a package that MS themselves made to be integrated. He doesn't add any tweaks or changes just completely makes it part of the disk. Recently he also made it uninstallable from the add\remove windows components section provided you have a original SP3 cd to provide the IE6 files from. Having said that he keeps up on the hot fixes extremely well so you don't have to worry about figuring out which hotfix is outdated or which order they go in any of that. Also with the WMP slipstreamer you might not be aware of this but it doesn't use the .inf reg entries from the pack and the fixes. It contains an inf in it. All you really are doing is making and integrating an addon with it, you just get to choose the hot fixes.