Which LMS do you use and why?

I found time to run the Articulate Online demo.  Very user friendly both from admin and user side.  So far, it seems to do everything we need which is, basically, publishing courses we design in '09 and/or Storyteller, maintaining the courses and reporting. It supports groups, which is huge for us.  The best part is, I figured eveything out without having to look at a manual or post a help request .. it's that user friendly!  I'm surprised no one else jumped in this forum string to support it (?).