The Framore mechanism sounds admirable, but I refuse to use a rotary cutter that you must open and close manually. They are a pain to use and just plain dangerous.
I have always used the Olfa Deluxe cutters (the 60 cm being my day to day cutter) because it's squeeze action automatically closes the blade when you take your hand off the handle. So. Much. Safer.
I would love to try a Framore with the Olfa Deluxe handle design!