It seems that some people just have to complain about any opinion or experience that doesn't agree with their own. Best ignored, I think.

I'm an iMac user at home, since 2006 (but still Windows XP at work out of necessity). I have the original 20-inch Intel Core Duo iMac with only 2GB memory. I have had very few issues with Poser since around version 7 SR3, and nothing major. I'm running Snow Leopard now, with Poser 8 and Pro 2010.

I've never used any anti-virus or anti-spam programs on my Mac, and don't ever intend to. It is intrinsically a more secure OS than Windows, as well as being less of a target for hackers. It needs less looking after, and is much more stable generally. Software updates are packaged and presented far better (in my professional experience and opinion) than the frequent and somewhat mysterious (to non-technical users) Microsoft updates I have to manage on client and server computers at work.

If you are talking about Poser Python script add-ons, I've only had one or two issues with such products, all now long since fixed. In general, any add-ons written in Poser Python should be platform independent. There used to be a problem with the different file path separator, but that was resolved with Poser 7 SR3 I think.

I do occasionally need to run a Windows program at home, and I use Parallels for this. The hosted Windows VM (Virtual Machine) is as much at risk from malware as a normal Windows PC, but any problems will only affect the Windows VM, not OS X.

"If I were a shadow, I know I wouldn't like to be half of what I should be."
Mr Otsuka, the old black tomcat in Kafka on the Shore (Haruki Murakami)