I use a Fiskers 45mm for just quick cuts. I was using Fiskars 65mm for the longest time when I had a few layers to cut but now I cannot find the blades for it.
I have a Gingher (45mm) that I love, feels good in the hand..smooth...love it.
I did not like the OLfa very much at all, felt flimsy to me.
I also have gotten in the habit very early on to retract after making the cut to save on blade nicks.
Kirsten