I know lots of people who use them regularly, but only register every result with work/ school if they are asked/ required/ harassed to.
Lots of them did start registering results on the website but like others said found it more hassle than it’s worth so most have stopped.
We have a couple of boxes but only have used one. We did register that result but found it so much hassle that we both agreed that we understood why people didn’t want to do that twice and week, every week, for whoever knows how long.