Theres sub and none sub version, subbed members get newer content speical events and such, or at least that the way it started.
We tried this when it came out, nice system but not one of us would count it as an MMO, there was very little chat anywhere, even gettin together to make a party took a load of faffing about zoning in and out before we could actually see each other.
Inventory system is VV Poor, very limited as to how mcuh you can carry and then some of the items take up huge chunks of inventory.
More like a 3d co-op rpg than a mmo tbh.
Lasted about 2 weeks and uninstalled it