This is excellent news - one question though - what would a user on XP see when he accesses one of these sites?
If Windows XP and Internet Explorer then they'll get a SSL error if visiting via HTTPS. Won't have a problem over HTTP.
I had an issue like this with SNI where a client reported being able to see another site that was on the same IP. The issue was that she was using IE on Windows XP, and SNI didn't work.