Apple Logic Pro /LogicExpress Discussion

I still have 4.8 in a PIII machine and 5.5 in a PIII also. For the 
most part, they're fairly stable. Been thinking about upgrading just 
because I don't wanna trail too far behind, but it's so expensive to 
just acquire the kind of problems I'm reading about day after day, 
with Mac and Logic 6 and/or 7.
Gary