Eye makeup brushes...

I usually just by the cheap ones because I'm a cheapskate mutha sucka.

But I was wondering, is there much of a difference between the cheap ones and the fancy expensive ones?
Do they blend better or something?
Or is it just the brand name?
What's your experience?

I'm asking because if the better ones are more expensive then I don't mind cashing out.
But if they're the same, it will annoy to buy an extra set that I don't need <.<