It's an item level upgrade, so it's an upgrade. You can move around green stats with reforging, but getting extra agi is always your priority.
---------- Post added 2012-12-10 at 04:52 PM ----------
I don't have either yet, just because the stars haven't aligned. The gain/loss is so miniscule that it's better to have them than not. The ascension change made FoF more attractive, so I'm using it more, even if I don't get a full channel off and the boss moves around.