After 14 years of Windows, we finally defenestrated it and upgraded to a Macbook last week.
The out-of-the-box experience was a dream compared to what we've seen with the two Dell machines we purchased over the last 4 years - no junk ads proliferating on the desktop and system bring-up with minimal user interaction. The system came loaded with Mac OS X Tiger and an upgrade DVD for Leopard. Upgrade was a breeze - load the DVD, agree to the license conditions, and within 20 minutes it was up and running. This is something I would never expect with a Windows system.
I've only used the Mac for web browsing so far - the real test will come when I start processing my photos, videos and home-audio recordings on it. We've already hit a hitch with the home-audio recording - the digital audio recorder records in the WMA format which, of course, Apple does not support.