For me, the difference/improvement is critical, but it wasn't until the last time I used the file (I actually have two of the thicker size, as their width varies enough so that one will fit when the other doesn't) that I followed a step by step process, using the same strings that the guitar came with.
1) Performed on a brand new Rainsong dread, it's sound was thin: flattened the bridge-slot floor's center scoop, leaving the underside of the saddle untouched (it was arched slightly in the center). The sound filled out, but still it needed improvement.
2) flattened the saddle's underside, rounded its edges, and the sound filled out even more so. From there it was only a matter of saddle material to get the guitar to its respectable self.
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