the mini was my first Mac. it was great to use it to switch since i already had a monitor, mouse, and keyboard. once i got my MBP i gave the mini to my parents and they liked it so much they just bought an iMac.
i bought it because i was tired of scanning Windows for viruses, spyware, etc. and worrying about the security flaws. OSX is just an easier operating system to use, too, mainly because it just does what you need it to do.