Apple Logic Pro /LogicExpress Discussion

Hey, has anyone taken advantage of the $50 intro price on Anatares'  
Harmony EFX?  I've been playing around with it, and it does a lot  
more than Logic's Pitch correction and the tracking seems better, but  
OTOH, I can multitrack my own harmonies that sound more realistic.   
Do people think it's a good value and useful tool?

Gregory