Good for suppressing fire, but if you have a non-NFA lower your finger might get tired. Good for zombie horde use.
Seriously, I have a 75 round AK drum loaded and ready for serious home defense use, and if I got a Beta it would probably go to the same mission. My wife is proficient with ARs, and in a serious home defense situation having 100 rounds at the ready without worrying about reloading would be pretty helpful. The extra weight wouldn't be much of a concern since we wouldn't be moving around very much, and she could put 20 or 30 rounds right though a door or wall to suppress whoever was on the other side without worrying about getting caught reloading.
Not that THAT would happen either, since we've practiced covering each other's reloads. Woe to the poor idiot who home invades the Nukem household.