I bought my mac back in 06 and I loved it. Recently, the disk drive has randomly failed, just after my AppleCare expired.
I have noticed over the years that Apple technical support is terrible. Every single apple genius I've met, (Ranging 5 stores) are nothing more than Apple cheerleaders. Constantly telling me how everything's my fault, when I later find out that large amounts of these computers had the same problem.
One of my biggest frustrations, was when I got cheated out of $80s. You see, I use Imovie quite a lot. However, the Imovie from 06 crashed A LOT. After a couple years, I had enough. So I bought Ilife '08. They removed %60 of the features from Imovie. I'm not even joking. Then in '09, they added everything back, plus MORE! But I didn't have another $80 to spend, so I was pretty screwed.
Also, I got one of my external hard drive backups stuck in my trashcan, so I can't empty my trash bin, unless I unplug the harddrive.
The BIGGEST problem with a mac I've seen, is that it is incapable of merging folders/files, unless you are willing to use a terminal command. So if I work on project files A, B, and C, inside of the folder "Important Project", but I edit files A and B on a work computer, then merge both "Important Project" folders, instead of having an updated A and B files, plus the original C file (Because I didn't edit that one), I end up just having the A and B files. it overwrites everything, instead of merging, and only replacing edited files.
I'll always stick with Mac, since I'm to busy to keep up with keeping a Windows computer away from viruses. And yes, Macs CAN get viruses, they are just extremely unlikely to.
I'm not bashing either computer, but my personal experiences have been pretty bad.