Back in the 90's I knew only one person with a 1200, but several who owned 600s as they were much cheaper. The plain 500 was the most common though, but when the 600 came out, you couldn't get the 500 any longer so people got the 600 instead.
I got the 500+ as I got it just before the 600 came out but I never knew anyone else with one of those.
But this is just a personal anecdote ofc, so can't be used for any kind of statistic conclusion.