Yesterday I received my 21.5" maxed out iMac with Fusion drive. First I transferred about 400GB of stuff from my old iMac. At first the speed was pretty good but not fantastic. Then, after about 1/2 hour of using Safari and some other of my most used applications, the speed really started to pickup. I could tell that iMac was "learning". Now the speed is incredible. iTunes opens before the first bounce. Safari opens and surfs very complext sites like a champ and Final Cut Pro X takes less than 5 seconds to completely open with my last project loaded. Bootup also takes less than 15 seconds. Did anyone else notice the learning curve? Also I ran a test and the read speeds are about 390. Not too shabby. I actually like the fact I don't need to worry about what files are on which drive. Makes life a bit easier managing files and apps IMHO. The whole system is also whisper quiet. Very pleased so far.