One of my favourite F2P games. I quit because of the heavy cash shop dependancy at 60+, but overall, I think its a very well made MMO, with plenty of features, items, skills, character customization and quests.
But yah, at 60+, it costs as much as WoW does in a month, per WEEK to be decent in pvp. You have to buy heirograms, replacement dolls, crafting mats (the amount required for high lvl equips is just way too much to farm) and possibly just extra cash shop gold so you can sell them for ingame gold (the game gets heavily inflated as people willing to put in real cash can get vast amounts of ingame gold, almost like a legal gold seller).