It's getting time to consider an upgrade to my computer (6 year old Dell P4 3.0GHz w/Windows XP Pro). I'm considering transitioning to a Mac. Anyone here switch from PC to Mac and care to share any thoughts, positive or negative? Anyone make the reverse transition?

My primary reason for considering the change (aside from the fact that the Macs look nice :-)) is that I'm really tired of all of the ongoing upkeep (antivirus, spyware, registry cleaners, etc.) and sometimes even the need for periodic reinstalls of Windows in order to keep the system running smoothly and to TRY to prevent the inevitable system errors and system slow down. That said, having gotten 6 plus years out of my current system and having it still run ok, if slow, I guess I can't complain too much.