Macs run hot. We used the one in our old office as a handwarmer in the winter (it sucks being in IT in an air conditioned room in a Chicago winter)
The rest of this is Opinion based on my years in I.T. It is opinion, mine and I don't expect you to agree or care... I'm gonna share it anyhow.
I'm pretty Anti-mac. Being in IT, I have worked on PC's, Macs, and Linux systems in our offices and with our end users. I find most of Apple's claims about the superiority of thier systems to be downright deceptive, (Hey, YOU try explaining to a doctor who is used to getting everything he wants because of that MD after his name that just because Mac SAYS it will run your PC programs DOESN'T mean they are actually runable under their emulator and to interface with the hospital that shiney new MAC you just bought has to go back and you need a PC). they do crash often (as mentioned above) when running emulation software or even 3rd party programs... and I dislike their "cartoony" interface with overlarge buttons that bounc and hop when you hover, and it annoys the crap out of me that Windows is starting to copy that.
From a Videographer standpoint, I have edited with Sony Vegas and also Pinnacle on the PC and Adobe on the Mac...
I hated editing on the mac... partially because I didnt find the interface as intuitive (which I admit is because I have more experience on the pc) but I also found that the PC was, on a hardware level, able to handle some of the complex rendering, and rotoscoping and the masking we were doing "better" (i.e. faster and with less error) because we could beef up the hardware, as opposed to the mac stuff.
Mainly... my huge complaint about Mac is the Kult of end users who have a weird Smug Superiority about being Mac users... Get over it, its a computer designed for, IMNSHO, Twelve O'clock Flashers. If you like it, great, but despite thier advertising campaign, that doesnt mean anything: It doesnt make you Hip, cool, stylin, whatever... it makes you a Mac user.
And as a last note, As far as the Virus issue goes... the "reason" you are "safe", isnt because Mac is secure... its because such a small percentage of people use them that it's less "profitable" to write virus for them. And if you are silly enough to have a Mac and claim, "Gee I dont run any antivirus, and I never had one" my question is:
Without somthing to detect it, HOW DO YOU KNOW?
Not all Viruses show up and do malicious things to your computer that you know... some sit quietly and gather information and broadcast it back without you ever seeing anything... there are plenty of backdoors and trojans that dont show up with any actual symtoms.