So here's an interesting looking grid addon for resto shammies.

Here's a snippet of what it's supposed to do:

"Makes a prediction of the jumps made by Chain Heal and sets a status on the most effective target to cast it on (based on the total heal)"

Now, I'm no resto shaman, but I'm becoming a grid geek, it seems. Is this the sort of thing that would be valuable for shammies? Has anyone used it and found it to work as advertised?