300 fps on a Cassio seems plenty fast to my eye. I never use the higher f rates, though the camera has them.
Remember though that if the camera doesnt have a shutter it isnt frames per second, but rather fields per second. Apples and oranges. Some of the new industrial high speed video cameras like the Vipor actually have a shutter. This whole frame rate thing is really changing quickly .............what used to be a US Army or manufacturing technology is now available to the public in the form of a point and shoot camera. Heck there is even a high speed golf specific camera on a cell phone.