Brad.. can't really say.  It seems that a lot of ppl in this thread have problems with hybrid rendering.  I've never had a problem at all so can't really duplicate any issues.  With the bigger, faster computer I've not really had a need to use it but I do know it just about triples my rendering speed and stuff looks just as good with it as without it.  Where I find that my images clear up faster is in the efficiency.  I get my efficiency up over 2000% and they're looking pretty good after only a couple hundred passes.  When it's down near a couple hundred percent it can take a thousand or two thousand passes to look really nice.