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My experience with them is "set it and forget it" but there are three pieces of advice:
1) RAID 1, not RAID 5. Apparently there are issues with modern hard drives where the drives take too long to recover in a RAID 5 situation. I don't know the details of this problem but my approach is allways KISS, and RAID 1, where two drives just become identical copies, seems like the simplest approach. This way if one drive fails, the other takes over; and, the best part, one drive can be taken out and run outside a RAID if need be. If you take out one RAID 5 disk it is useless.
2) Hardware RAID, never software. A motherboard that can do hardware RAID is only like $10 more.
3) Never RAID 0. The zero in 0 is the number of files you will recover in case of failure.
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