A previous windows vista user, I used the free bundled version of Power Director a lot. I recently bought a Windows 7 machine which doesn't have Power Director bundled in. I tried Windows Live Movie Maker - absolute rubbish, and started hunting around for the best way to buy Power Director. Based on this:
I thought that Media Centre Centra had the version I needed, however all the additional stuff I was looking forward to playing with - the biggie for me was four audio tracks - is not in this version. There are several pop ups prompting an upgrade when you try to access some features. In essence - the version of Power Director bundled in here is equivalent to the free one bundled in with Windows Vista (at least on a machine bought from HP). So although it's a solid product, I am massively disspointed. For me the key product in the Media Suite bundle is Power Director, and the clash between the expectation created by the feature list in the link above and the actual product is quite big. (i.e. the implication is you get everything except blu-ray)
The user interface is nice - not played with all the products in the suite yet (and some I never will), but the audio editor is nice and easy to download a wide variety of sound effects, however as before I'm back to trying to get the best out of two audio tracks which can become tricky quickly when you begin changing the time lines as I like to layer a lot of sounds there.
Maybe I'm judging harshly - but I wanted a richer version than the free version of PD and in the end I didn't get it. One anoying suite feature seems to be that you can't run different parts of the suite concurrently. To get from PD to the audio editor I had to save the project and shut down PD. At this price it is hard to be too annoyed though - but make sure that you focus on finding out if the parts of the Centra version of the suite you are interested in actually have the features you need. I tried to do that, but should probably have researched harder.