Um, I got one as a birthday gift...
It‘s actually a nice agility training if you‘re not playing an instrument, and you can learn it in a day or so (and use it for two more

). Build quality is also nice, with the case and all. Some VR geeks did wear it as a signature item, when it came out.
However, for actual typing its too slow, even if you are a skilled typer. There are a few tool alphabets/short cut bindings that might make sense for the lazy internet surfer, music listener but other than that... Maybe as a remote for... if you don‘t have a smart watch or voice assistant... It‘s sitting decoratively on my shelf now.
The most annoying thing is the fact that it only works works well on a hard surface as it has to detect that tap’s stop acceleration. So no usable typing on your thigh, mattress or without having an actual firm ground at hand, which were the only use cases I would have found helpful. You might use your tablet as a base to turn the whole idea into madness
I liked it as a gift though even if it‘s just a way to combine acceleration detection chips with BLE, both inexpensive HW components these days. Sphero does a similar thing with their color reading tap rings.
Maybe with a second one it would make
sense, since one should always try to do more of the stuff that did not work out to finally succeed...