I own Realm crafter and here are the pros and cons Pros: Easy to use zone building Easy to get servers and clients up Nice And easy terrain building A great Coding Language and you dont even need to use it if you cant code.. It has many MANY customizable options and if you own Maya or any modelling program you can easily import models Architect Mode so you can design interior's which is uncommon in alot of MMORPG ( the ones i have played ) It has many great and powerfull tools ( i cant name all of them xD ) Cons: It can be a Tad daunting at times. if you arent good with servers and the basics of hosting you may be a little offput by this. It has A few limitations BUT NOT MASSES