I made myself a Premium player after several days' tries and found out this is a great game, so I think Premium worths it.
Apparently lot of stuffs are still worth improving.
I think the singly most important thing to develop is the Character Classes differentiation. You can see clearly no matter what role you choose, you fight like a warrior using STR/DEF. I am a mage and I feel not at all fighting like a mage.
I believe this game should have already designed a very good Character Classes differentiation, only it takes time to fulfill.
It would be good if GM can somehow unveil your plan for this.
I belive everybody will be very interesting to know.

And one more thing, Royal Credits is really too expensive. I would have already done my second purchases for Royal Credits so I can buy Energy Cloak if it were not so expensive. :-(