Assuming it's like I last played before they changed hosts; The game is pretty good. Leveling seems to start stacking around lvl 40. You class change at 80. There's assorted equipment and skills to customize your character with.
It's like Maplestory with a more polished battle system and more humanoid-shaped avatars. I personally played a Warrior who was going to be a Berserker(or w/e the greatsword class was.) But the grind got to me eventually and I just dropped.