Downsides of Mac

Downsides of an Apple Mac (PC) computer.

Poor quality operating system
Logged in user switching is not enabled by default and when you try to enable it it gives a warning to do with security if this is not a secure room. Linux allows fast user switching securely whether or not your computer can be accessed by others.

3D desktop "cube" effect only works for changing users (which is considered to be insecure, see above). Linux Compiz Fusion, which admittedly is not available in most distributions, has many, many more and more impressive enhanced desktop effects.

These shortcomings might night seem that great on their own, but considering that Linux is free, and they could have just made a copy of it to call Mac OS X (they still can), it really makes no sense that Mac OS X has any shortcomings compared to Linux at all.

Bottom line
An Apple computer isn't even a good computer when you put Linux on it. They are too poorly built.