I bought one of the 9A5N Iambic Solid State Paddles at last year's Dayton. The paddles use a MEMs device and do not move. They are adjustable between 10 grams and 50 grams of pressure using a pushbutton on the side of the paddle. I like my paddles to be set at about 20 grams which was a very easy adjustment and verified with my dynamometer. While it initially seemed strange that the paddle levers didn’t move, it didn’t take long until I was completely comfortable with the “feel” of the paddle at my top CW speed. The only downside is that they auto power off to conserve the batteries after 40 minutes without use, and I sometimes forget to turn them back on if I haven't been sending for a while.