i like vibrating. kind of relaxing in its own way.
me and a friend did a comarison of subs like this. 2 in one chamber and each in their own. found that on the same amp with the same amount of power at the same volume the subs that each had a chamber performed better. seemed that they hit a little harder and cleaner. my thoughts were that they were not fighting each other on the beats, not fighting for air as one takes it away if you catch my drift. probably not the same as others have found, but i figured i would throw in my .02