I will preface this comment that I do not consider myself a double bass pedal player. I have owned a few over the years and quickly sold them as I far prefer playing gigs with a single pedal . That being said, I do own a Yamaha Direct Drive double pedal from the last series before the FP9 came out . It has a nice smooth footboard , it is very smooth and quick and I quite enjoy playing it on my practice kit .
Yamaha bass drum pedals are very underrated , I have had a few over the years and they are very good workmanlike pedals . Maybe it is the lack of fancy features or the lack of advertising on Yamaha’s behalf that leads to this lack of knowledge . Too bad because they are worth looking into as they can be had quite reasonably and they play well and are very sturdy and reliable .!