Raid 0 is simpler..maybe that would be why.
here is a good raid link
http://www.acnc.com/04_01_0p1.html
And it says about raid 0+1 ----> "All drives must move in parallel to proper track lowering sustained performance"
So RAID 0+1 is still fast..just not quite as fast as Raid 0...but of course in Raid 0 if you lose either drive..you lose all the data...Raid 0+1 has 4 drives so you can lose one and still recover etc.
Raid 10 is a similar idea to raid 0+1 but it has two pairs of mirrored drives forming a stripe set....I dunno which is faster between raid 10 and 0+1..my gut says 10 is faster.