Beanbag will stun anything up to a lieut, and if you have access to another stun power, you'll be able to stun bosses, which makes it very nice for a soloing blaster. Being able to take one foe out of the fight is very good solo, but in teams the usability is a bit limited, unless stacked with another stun.
How long does the stun last with BB anyway, I was thinking getting it for some pesky LT's and minions you encounter 40+ which do nasty disorients or sleep. For soloing of course. 
With one disorient enhance you can perma-stun an even level lt. With more it will last longer on higher levels of course!
Since Buckshot seems an awful short ranged cone with average damage, I was thinking I could replace it with beanbag (since stun sounds way useful than the bad cone attack).
Now what is beanbag like in PVE? Any use perhaps, against sappers and nullis and other mobs that do disorient of some sort?