Apple produces good products, but locks you into their proprietary world: probably the biggest reason why I don't own anything Apple.
There's a second reason I don't own anything Apple, price. When I was building my current computer I was using a work-provided MacBook, and liking OS X. I figured I'd see what a Mac Pro would cost configured similarly to the PC I was considering: dual quad core processors, 16 GB of RAM, two 15k RPM drives large enough to run the OS from RAID1, also a slower 10k RPM storage array of mirrored 1 TB disks--all SAS controlled. A 512 MB video card, and a 26" professional quality LCD.
Long story short, my PC build cost $6000. If I were to get the Apple it would have been $11,000. I prefer Windows 7 to OS X too (prefer Ubuntu Linux to both).
