OS X is the reason to have a mac
That is the reason not to have a mac, lack of software support, neither my mobile phone or my GPS are supported by mac OS X, I guess if your into graphics and basic
stuff their good.
if you want an that you can leave running for a 4 months, like I have, without it needing to be restart then the mac os x is perfect!
I would not say basic stuff either, quite a large portion of the professional astronomy community now use macs. Macs run faster than their windows counterparts and have a wide range of tools available, especially if you are a unix head.
I'd agree there is a lack of support for external devices (its getting better and there are loads of project pages around the place with hacks on how to get devices to work)... but has anyone turned on a vista machine, no support for anything really.