What's the point with ISO 125?

Ehm... maybe I haven't understood the whole ISO metric system (100, 200, 1600, 6400, and so on...) very well, but... what's the deal with 125 films?!

I mean, there's an obvious difference between, say, 100 and 400 (grains, speed, and more), but what big a difference could there be between 100 and 125? It's not so much faster that you can clearly see a difference in the grains or so. So... what's the point? Am I missing something? I've tried using Kodak's 125 film, with not so positive results compared to Tmax 100 or Fuji's Neopan SS, so... does anyone know the "secret" behind 125 films?

Thanks.

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