I have never found 30fps to be satisfying on computer monitors (TV's may be different). Even if its a stable 30fps, it just looks choppy to me.
60fps is nice, and all around smooth. 144fps is like gaming in an alternate dimension (great thing) compared to 60fps.
Some people insist your eye/brain cant determine the difference between 24fps (most movies) and anything higher. These people are flat out wrong!
Then again, some people can't see the 'flicker' in florescent lighting, 60hz lighting gives me a headache pretty quick.