This is pretty cool IMO. A study made from this where a large group of people had a pen like this and then you compare the patterns.
They'll definitely be different based on so many things like what kind of work you do, hobbies, obesity, "phone neck", how much of a social life you have, what kind of devices you use most.
Now I realise that there are too many variables, still would be cool to see differences in patterns from different individuals.