I submitted this question to the Aperture forum too, but wanted to see if folks here have some advice as well on the video side specifically
I'm working on a future new setup, with a MacBook Pro and deciding whether to set up my external drive (that holds all my media) as RAID 0 or RAID 1 (or I suppose something else) based on performance. I use iMovie most of the time, but FCP when I'm looking to do a bit more advanced work (I'm like an advanced hobbyist I guess...).
I realize the differences in redundancy, here I am just curious about performance - if there are huge benefits in using RAID 0, I can certainly set things up that way and make sure to get an additional backup elsewhere.
If you are going to be regularly editing multicam projects with four or more cameras, then the RAID 0 can definitely make the difference. Otherwise, IMO, it's not necessary – especially with a relatively new MBP.
In FCP, you can solve any playback issues by changing playback preferences to Better Performance and the ability to switch to proxy media while cutting off line.