For work at home, I own a Mac Pro 8-Core machine (2x2.66 GHz), with 16GB RAM and an ATI Radeon HD 4870.
I work with film, motion graphics, graphic design, and other fields in creative design. I also work in Logic Studio for music production and audio design. Of course, when I am not working on projects, I use this machine as a personal machine to surf the web and check e-mail.
I purchased this Mac Pro not only because of its massive amount of power, but also because of its unrivaled efficiency. I've also admired Mac OSX for quite some time, and I am looking forward to the speed bump I'll be getting on August 28th when Snow Leopard releases.
In terms of general experience, I find Windows to be more standard and "navigable." However, the Mac OSX interface is sleek and streamlined. What is amazing, though, is that Leopard takes that surface visual streamlining, and applies it to the system's behind-the-scenes workings. I've never felt so much responsiveness just working on a computer before. Mac OSX just "feels" better to work on. In addition, many of the applications, including the CS4 Suite, run better on Mac OSX than on Windows.
And whenever I need to use Windows, I find it very easy to either access Windows XP 64-bit in VMWare Fusion, or quickly reboot and run Windows 7 64-bit. This ability, for me, justifies Apple's higher price tag. I get the best of both worlds, as well as a colossal amount of power to run it on. No flaws, just quick and snappy computing and higher productivity.
I also own a 2009 Macbook Pro 13". It serves more as a family travel computer, and my parents use it for occasional surfing and e-mail. I use it as either a remote desktop to use my Mac Pro externally while I am away or downstairs, or I use it on-the-go for academic purposes.
I'd rather take 2.5 GHz Macbook Pro at 13" for $1399 than a cheap netbook with a fraction of the power and efficiency at $399. Apple's Macbook line consists of beautiful machines, and they are just as efficient as the Mac Pro line.