i learned to use both ,, switch back forth all the time if.. finding a number 1 or 0 replaces the straight blades i cut much faster and steady now with spirals flying dutchmans are my new favorite ... don't notice any different from flat to spirals .. but could cut a little faster with spirals working on the owls from the new scroller magizine ,,, but i do a lot of portrait type cutting trying to go back to basics but i like the challange and the end results of harder patterns