[Rails] Which State Machine?

A few years back I used AASM. More recently, I just build state 
functionally by hand on an as needed basis. So I check out 
rubygems.org and low-and-behold there are many offerings. 

Here is a sampling: 
http://rubygems.org/gems/state_machine 
http://rubygems.org/gems/aasm 
http://rubygems.org/gems/acts_as_state_machine 
http://rubygems.org/gems/statemachine 
or all of them: 
http://rubygems.org/search?utf8=✓&query=state+machine 

My question is... which one is considered the current "standard" in 
state machine gems for rails 3? 

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