I made the switch in 2010, here are my experiences
Pros: The machine is faster than any PC i have used, even the new i7 ones. It boots in just under 30 seconds and shuts down in about 2 seconds
Battery life hits around 10 hours with internet on and screen on medium.
Keyboard lights up on laptops which is nice
The trackpad is better than any PC I have seen and multitouch is its best feature.
No viruses
No crashes
No breakdowns
No "Please restart to finnish updating"
Macs dont run out of memory to easilly
Macs now have an app store so finding software is no longer a problem
Cons:
You cant take the battery out
Theres no Blu-Ray although I've never cared for that much anyway
You have to restart the machine and use boot camp if you want windows programs
Not all external keyboards work, macs have extra keys
I liked the switch to mac, the OS is much easier to use than windows, although there is a slight learning curve. Macs are fun to use and generally get things done faster than any PC ever could
Its designed to be a better computer, and I can say Apple did a pretty good job
PS: If anyone says "They're overpriced" or anything along those lines, no they arent. You get what you pay for, a computer that will still run in 10 years, with no crashes and never needing any maintenance.