I only got to use this service a few times back in my younger days, and
even then, only with the demo accounts, and that at 300 baud (yes, baud,
not just BPS.)
I really couldn't afford their insane prices, but from what I saw back
in the day, it was a huge, vast place with lots of goodies.
http://www.boingboing.net/2009/07/03/compuserve-shuts-dow.html
http://www.basexblog.com/2009/07/03/compuserve-requiem/