After using a model M for so many years the model F feels too light. I am glad to see someone making a new model F for people that want them though. I just bought a Unicomp new model M to keep in a box for the day my original keyboard finally dies. If I had to work in an office with other people I would use something quieter, but since I have a detached home office I can make all the machine gun typing noises I want. I am a firm believer in buckling spring. I am 38 with no signs of RSI.