I recently got the mid range 15in MBP. The firewire 800 port is a particular interest of mine which I am expecting to be able to depend on and take advantage of. But much to my dismay it is very irregular, and many times drops down average USB2 speeds or even slightly less. Now dont get me wrong, the FW 800 port has done almost double the the fastest I have seen USB do, but what I cant figure out is why this is only happening sometimes and sometimes this same FW is performing worse I have three different FW 800 drives now and have tried all sorts of things like switch cables, verify, repair, or check disks/permissions, and basically anything else i thought might help. Still, sometimes its really fast and other times, not. I would say for the most part FW800 is transferring a little above USB speeds, which is better than nothing, but actually still disappointing. Anyway, if some one has any experience or advice about this, let me know. I dont see why a drive will act one way once and another the next time. What might be effecting or causing this? Is this normal?