I definitely can’t tell the difference for anything above 120hz or so, but I recall reading an article about counter strike several years ago, which showed that pro players can see an increase in performance with higher refresh rates up to about 300 or 350 hz (as long as you have the fps to match it, lol).
Not local, but I’ve been using my withings scale for at least 5 years, and I sync the weights with its home assistant automation from the withings api, then plot the data on a custom health dashboard I made.
I’d love a local alternative, but regardless I haven’t had any problems with my setup.