Alfresco is like many other companies with Mac and PC camps. I converted less than a year ago and now use a top-of-the-line MacBook Pro for work. Any lingering doubts were removed last week, during an onsite training course.
A colleague of mine conducted the training from his Windows XP laptop. It barely stayed running all day without something having to restart or reboot - just to accommodate him as a single user.
This coupled with other logistical issues forced us to utilize my Mac as a classroom server so we could keep the course going. The 2.33 GHz Core 2 Duo with 2Gb RAM streamed along effortlessly and scaled to handle our peak attendance of 18 concurrent users. Quite the contrast in performance.
So much so that my co-worker may finally convert himself. Seems he had a big Mac attack!