I haven't played FFonline yet, but I've been watching the camera float through the game, this games faulking great! I'm glad Squaresoft accomplished putting this online!
The only thing I'd say though that I've been dissapointed in for a while is, I wish Square would finally create a Final Fantasy game that is at least as great as FF6 or better. In terms of their technology, they make games that look great, with nice gameplay with good battle systems, music, etc. But lately, there ideas, which is an important thing to have in an RPG game suck, compared to what they've done in FF6. (what I mean by 'ideas' is, unique story, characters, etc. FF6 had a lot of origonality, while this game, in many ways, is similar to Lord Of The Rings in terms of look and feel, armor and weapon style, village design, etc. FFX is probably the closest FF I've played and beaten that comes close to how good FF6 was. With all that said tho, this online version is still damn impressive.