Bean bag can change shape according to the posture you sit so theoretically it should be more comfortable than normal chair.
Personal experience: I didn't get the "very comfortable" feel with my bean bag. Maybe because they are cheap. And maybe expensive bean bag will be very comfortable. 

btw..

5 redmi note 2 oredi on the way for my frens n cousin
thx gemfive

Well, sure-reach really messed up today They delivered wrong item to me. It seems that they mix up the tracking number and they sent me a phillips bar speaker which was supposed to be sent to Johor. I'm in Kota bharu.
So the delivery guy told me to take the item first and they'll contact me once they trace where my original item is. Supposed to be an LG Speaker. This really sucks as I've been waiting for like 3 weeks already when the delivery time was stated to be 3-5 days.