NEMA17 steppers, much difference between 0.9 and 1.8 degree step size?

On my Prusa Mendel RepRap I have Wantai stepper motors. I get them off Ebay, straight from the factory. Like something out of Home Improvement, I went a little over the top and got steppers that are a tad overpowered for 3D printing. But, I love them, they barely break a sweat or heat up even after hours of printing.

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