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Could you summarize what benefits moving to Rubinius would buy Ruby developers?

I'm an outsider looking in, so while I know what the MRI and Rubinius are, I don't know why I'd prefer to use Rubinius instead.

* Written mostly in Ruby

* No GIL

* JIT

* Better garbage collector

* Better debugging tools

Unfortunately, Rubinius is not yet complete, so it's not a suitable MRI replacement for now.

Thanks very much!

Without the GIL what does that mean for extensions written in C. Would they need to be rewritten?

Here's Evan Phoenix's answer from a while back: