This is hard to say.
I´ve read different figures from different sources claiming everything between a 30 to 100 procent increase in speed. I guess the practical increase in speed depends on what you are measuring; is it one big file the speed should increase more compared to a situation where you want to read or transfer many small files.
This also can explain different users reactions varying between satisfaction and disappointment.
NB: In general a hardware RAID works more efficient than a software solution.
Also consider using a backup. RAID 0 gives no data redundance and it's hard to restore data from a pair of drives in case something bad happens to one of the drives.
2-cents you know.
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unicorn
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