Hi... I just ordered my new mac (Black MB, 4gb ram), and I am also considering taking the plunge into Logic pro. I will be retaining my Saffire LE for input. Does anyone out there use logic on a MacBook, and if so, how is the performance? I only ask because I currently use garage band right now on my iMac G5 and I somewhat regularly overload it with plug-ins and tracks... So before I spend $500, does anyone have any thoughts? Thanks.