I'm not sure what you meant by 'is it worth it?'
If you are asking whether Apple made a mistake in setting the price difference between the 2 models (too low or too high), then I think it's highly unlikely.
If you are asking whether we think you can justify spending more for the added features of the 2.4 model, how would we know?
If you are asking whether we think we can justify spending more for the added features of the 2.4 model, why would it matters to you?
The difference in performance between the two models are measurable, but you are not likely to notice a HUGE difference. Especially the day-to-day tasks like web surfing, emails, word processing, iLife apps, playing music and movies, the two models perform essentially the same.