I used RubyMine for a bit, but I didn't love it. I've never really been one for full-fledged IDEs though.
Do you work on really large codebases? I've heard that's the best time to use a true IDE.
I love using RubyMine for any size project, even single scripts (using the scratch file functionality). RubyMine just does an amazing job linking together classes and allowing you to jump into documentation and source code of gems you're using. I've used RubyMine for projects ranging from single files to 10k lines of code.
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