Depending on what you do, good scissors (properly maintained and sharpened) are a must and an unbelievable difference.
Mostly for what I do, is about the rotary cutter and I'm fine with basic Fiskars (I have a sharpener) for thread snipping and etc. But if I went back to garments or costuming, I'd be wanting a couple of nice pairs of scissors. I do believe in changing blades often, that a blade is about/less than half a yard of fabric, but can make 5 yards of fabric icky to sew with if past it's point (or being asked to do too many layers).
A lot of my long-time Gingher using quilter friends are buying new/smaller/specialty scissors from Kai.