I've seen a lot of people mention that they leave their computer on 24/7. This got me wondering how many people do this. I personally only have my Shuttle on when i use it and I really can't see any reason to have it on while I'm at work. When I mod the PSU I definatley don't want to take the risk in leaving it on for hours.
What are the advantages/disadvantages of leaving it on the whole day?