No one has mentioned the disadvantage. You will have the ability to modify/customize your phone but if you make a mistake because you don't know what you're doing and especially since we don't have the ability to return it to stock, you can brick your phone (make $200 "brick" since it will be useless).
So if this is your first time doing this and since you spent a pretty penny buying it I would leave it alone until fastboot files (ability to return to stock should you f-up) are available.
May only be out $200 on the bricked one, but then go ahead and count in $500-$700 for the replacement. Now thats a REALLY expensive brick.