I'm sorry, I'm having a hard time designating any Amiga to LEAST popular. Lame, I know.

But like someone else mentioned earlier in this thread, times change. I remembered hating the A600 when it came out, but being relieved upon seeing the true successor to the mythical A500: the A1200. But now, in the mind blowing, dazzling 21st century future times we live in I have an A600 in my collection and I really like it for its compact size and ease with which I can stick a Compact Flash card into its IDE port using a CF-IDE adapter. Funny how things change.