I needed to pick up Ruby for a two year job, and RubyMine made my Ruby learning so much fun. I really appreciated the clever autocomplete and especially the suggestions. It would give recommendations like "this works, but it's not how people do things in Ruby. Try this instead" and the recommendation actually looked so slick and elegant (and Ruby-like, and not Java-like where I come from). I hope in my heart that sometime I'll have to use it again.