I tried RubyMine, it's perfect! There is only one thing that prevents me from using it, it's performance.
I guess the main "performance consumer" is all these "intelligent" machinery like "code completion", "code suggestion", "inspection" and so on.
In Jave these features are very handy and usable, but i doubt that the situation is the same in Ruby world. For example, in our project we are using custom classloader and all these staff is completely useless.
Maybe it's worth to implement a "magic button" that will disable all this features? I've looked at settings but not found such option.
And you will get advantages from two "world" - super "intelligent" IDE for one who really need it, and fast and cool IDE with debugger and other basic features for those who don't.
What do you think about it?