Everyone needs scissors, but, if you are doing lots and lots of strip piecing, a rotary cutter is your best friend!
The art of improvisational quilt piecing may not have developed if the rotary cutter hadn't been invented!
What kind do you prefer? A small one for cutting curves, a big one for slicing through several layers of cotton at a time, or an ergonomically friendly one with a safety feature, like the one shown here?
Bring your cutting tools to QSDS and use them in classes such as the ones taught by Rosale Dace and Judy Hooworth. Pat Pauly's classes even have the word "improv" in the titles!
Check the classes out here: http://www.qsds.com/classesbysession2017.html