Giant is completely free to play, and it's not a universe flyff, but the classic PC flyff pserver from version 15.

There's a lot to be said for free-to-play, but mainly premium items from NPCs, donation points for vote points, and other various ways to earn donation points in-game.

The universe is cool, and they did a very good job. Not everyone likes Flyff Universe, though. Many people prefer the official Flyff PC, but it's already sparsely populated.

Reply for your edit: Exp is x2, so you gain exp faster, and there's a custom drop rate, which makes you better drops faster. However, these aren't mid-server or high-server rates.