I recently went back to my Aion account for the 2 week reactivation, preceding the eventual F2P model, and I have to say...
I hate grinds, I hate long, boring hours of seemingly accomplishing nothing, and Aion used to be filled with that. But now that I'm back, I really have to advocate it. Anyone that is considering trying out Aion when it goes F2P, do not hesitate. I have never had more fun in that game till now.
The community is starting to revive itself, instancing is fun, gameplay is fun, the community is friendly. I'm really enjoying it.
So in conclusion, if you're skeptical about F2P Aion, just give it a shot, you may fall in love with it like I have, again.
That is all =)