I started off with a 486sx-20, 2MB RAM, 107MB HDD, DOS 5.1/Win 3.1, $1499 back in 1991. Many computers followed, all DOS/Windows boxes. Took the apple plunge with a late 2009 21.5" iMac, 4GB RAM, 1TB HDD, OS X 10.6.x, $1499.
The iMac hardware is still performing flawlessly, still runs everything I throw at it with great speed and reliability, and still feels new. ALL of the software included in the standard OS X distribution is top quality, does what it is supposed to do, and then some. Garage Band? Amazing! iPhoto? Perfect. The absolute garbage that came loaded on that old 486 and all the boxes since were either trial versions or flaky. I never felt I got all I could out of my computers, always felt they were obsolete at purchase, always felt the software / OS was irresponsibly 'cobbled' together.
During the last 2 years of computing with my iMac, I have never, EVER had a program lock up to the point that I needed to power down my computer. With Windows, that's a very normal occurrence. You know, the "blue screen of death". And, for anyone who remembers DOS, "abort/retry/fail?" anyone? Quality.