Another plus for the Roland's (an 'up-to-date' feature lacking on all these supposedly 'up-to-date' arrangers) is if you are the kind of person that likes to edit and personalize your styles and sequences (and how often do you hear a sequence that you go 'this is already PERFECT!'?
), the Roland's are, by a country mile, FAR easier to get into the style or sequence and edit it, including drum sounds within the kit, tuning, effects, etc..
Nothing even comes close to their lead in this aspect of usage. If you are content to play a less than perfect style you found, or a sequence that the sounds aren't quite right, or the drumkit plays poorly matched drums, you might not need this stuff...
Me, I can't imagine anyone NOT needing this stuff..!