It works by alternating stripes(chunks of data) written to each volume.
So, you will get about twice the amount of data on what looks like just one logical volume.
Sequential benchmarks look good because they use specially written apps that drive the units to their maximum using overlapped I/O.
Unfortunately, most user apps do not do that, so your may be disappointed if you do not see any improvement in actual performance.
On writing, it is an option to cache the writes and continue on even though the write has not been comitted to the drive. For security and recovery sake, you may or may not want to do that. Then, the writing part will not do the overlapping that the raid-0 option depends on for throughput. That results in performance of a single drive.
If you want to use raid-0 as a way to increase the single image of your "C" drive, that is a reasonable thing to do.
I have done that using smaller ssd's. (with good external backup)
A down side is that a failure of a single drive, or the motherboard raid controller will render all of your data unreadable.
My take is generally to ignore raid-0 in any normal desktop situation.