Originally, I was walking past a shop window that had a XT and an Amiga 500 both running Battle Chess in demo mode. You can imagine how that compared.
As I explored my first 500, I was very impressed with the thoughtful and logical OS, it's efficiency and the way it's designers obviously tried to make it the best possible. Nothing was hidden inside, any user can get complete info about the OS and hardware. A whole community gathered and wrote a mountain of software for it.
I still love it for all the reasons above. Now I also view it as a peoples computer, not the property of a sinister corporation. Today, I'm awed by the way the original open design has allowed modern uses and hardware to be integrated into it.