I bought this as a small, efficient computer that didn't use much electric that I could leave on 24/7 when I wasn't around. Installing the memory and hard drive was easy. I've loaded Win7 onto it which runs nice and snappy. If the room is silent you will hear the very faint sound of the fan. If the room is dim/dark you will see flashy lights bouncing of the walls, but all in all it's a great buy.
Personally any additional software I'll be loading will be PORTABLE so it doesn't slow Win 7 down. For any of you that aren't aware of portable software, this is software that you COPY to your hard drive, but do not INSTALL onto it. So the registry doesn't become chocka with rubbish and eventually slow down. Interested? Google for 'PORTABLE APPS'.
I've only had this for a week now, but at this point I would thoroughly recommend this. At this point, it is one of the more powerful Zotac Z-Box(es) on Amazon, apart from the much more expensive BluRay one. Check for the model number in the details, then check out the Zotac website for comparisons.