Clever. I guess good is the operative word. I wonder if on mobo raid does that.
No, not the usual stuff, e.g. everything from NVidia, Via etc is right out. But I wouldn't trust it with my raid1 anyway. People keep saying that Intel's onboard RAID is actually good but I haven't tested it.
Myself I use Linux' software RAID and it kills everything else. FreeBSD also has decent raid1 and a filesystem with integrated raid functionality (ZFS). That's probably not an easy option for most photographers, but if you have a fileserver separate from your PP box anyway it might.
Windows does have software RAID built in but I didn't test that either.
"Test" is critical here. Before you put anything on a raid1 you need to test it, how it behaves on a sudden disk fail and how it recovers. You need to pull the cable off one disk, see what happens, write some more data (so that it is only on one disk), plug the other disk back in and then when it starts recovering you pull the power plug out of the whole box. After reboot you'll see how well it recovers. The NVidia onboard stuff is legendary to fail here, because the two parts (the driver in the OS and the part in the BIOS that does it before the OS is up) apparently sometimes disagree on who the good disk was. KABOOM there goes your data.