2.5 years and going strong. Only half full. No problems.
Would buy it again.

Well... other than the one incident noted above that was user error... this raid has been flawless. Still have about 1.25 TB left... partly because I switched over to jpegs instead off tiffs for most clients. I'm due to go in and clean out files I don't need anymore.... but that will have to wait a couple of weeks.
3.75 years and going strong! Still the same drives too.

I have Crashplan also... for the computers them selves... but not for work files that I need quick access to/ I have seen CP take foreverrrrr with some files.

Coming up on 5 years. No issues. Would do it again, and probably will.

I never did fill these drives up. Have some drives as back up/stand-by but haven't needed them.