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That article and corresponding REE marketing pages do a great job of telling me why I should use REE.

Can anyone tell me why I shouldn't use REE? (Currently using MRI 1.8.7)

If you don't need the memory savings, you probably want to start migrating to ruby 1.9 for the speed improvements. JRuby is also a good alternative. (faster than 1.8, OS-level threads)

So no reason to not use REE, but there are other alternatives that have their own strengths.

When you want to use 1.9. You should really only be using the 1.8 branch if time or money prevent you from doing the upgrade.

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