Exactly! On the line, or to the side, not both, consistancy is key. I like my Olfa too, and thanks for the recycle link I've bookmarked it as well.
One thing not mentioned thus far is rotary cutter safety: always keep the blade closed when not making a cut. My quilting mantra is: open, cut, close, open, cut, close. It's amazing how sharp those blades are and how easy and quick it is to cut the daylights out of yourself. Being new at quilting I can already tell you that one from experience. You just need to get clumbsy once or get distracted and you'll have blood all over (I wonder when this item will hit a horror movie?).
Repeat it: "Open, cut, close, open, cut, close..." :!: