Get the stitch regulator. It really shortens your learning curve, if it's a good one. Mind you, no stitch regulator is going to keep your stitches even if you go from zero to sixty in a half inch. You still want to stay smooth with your speed, no sudden bolting or braking. But the stitch regulator will enable you to go faster on long curves, etc. and slower where there is detail, keeping your stitches even. Without it, if you have a pattern with both detailed areas and long flowing lines, you'd have to choose your speed to accommodate the slower detailed areas, then be stuck at that speed while doing the long flowing areas.
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