I'm currently running CS4 on my MBP (specs in sig) running SL and I've been having nothing but issues recently with performance of the CS4 applications (Illustrator, PS and DW). As many users have reported compatibility issues with SL, it has been getting worse lately. Between beach-ball freezes and the programs quitting unexpectedly - I'm about to pull my hair out. I'm curious for anyone that has upgraded to CS5 do you notice any improvement in performance/stability. Should I just bite the bullet and upgrade, should I upgrade my MBP. Please help! Cheers!