Used it several times to save my group.

Also used it several times and got little for it, but it was there, she had 4+ stacks, and dead DPS do nothing.

As for the stay on the cloud thing, I feel it's an incredibly stupid suggestion. No, I do understand how it works, but all I ever see is people thinking everyone else but them will deal with the mechanics. Meaning NO ONE is dealing with them except me, the other tanks and maybe a brave healer or two. If you go in preformed, sure, but I would never risk it with the DF.