Yes I did, I had a level 80 Warrior. It is very intense especially with a guild.
This game is very much too good to be true to be free. Graphically dazzling (Too good to be F2P) and the higher levels are just mind boggling, not to forget to mention the INSANE SIZES OF MONSTERS as you approach higher levels (70+).
Game is seriously lacking in quests, and tend to get VERY VERY Grindy. However - very often they have Experince events every month - and experience multiplier vouchers are available for purhase with their "Coins" in game currency (Avilable through Paypal and even MAIL IN payments!)
If you live in the UK, or anywhere around Europe, they have recently released their own build version titled "Dekaron" - original title of the game.