No compatibility issues, much better interface, much for stable, Apple has better customer support, works seamlessly with iPhones, iPods, etc., and if you ever feel the urge to use Windows ( you won't.

) then there's always Boot Camp. Apple's
Get a Mac page may also be helpful to you.
The only downside is that when you buy the Mac, you will hurt yourself for using PCs for such a long time.
- John