I started it over 8 years ago on vB 3.something, then vb4 but vb5 was horrendous so moved over to XF in December. I love it and the members picked it up very quickly.
Currently over 12,000 members with around 1500 active in the past week, though winter is our down period. I don't worry about post count, it's showing ~1.2 million but over the years I've pruned probably another 500,000.
Any thing you like or don't like? Suggestions?