I used to use it, but frankly it's pretty useless. The main problem is that it has no long range capabilities, since it has some weird arrow 'dip' on it that makes it utterly useless past about 30m. It's just not accurate enough even at short distances and while it does pack a punch if you can hit with it, those hits are far too few and far between to make it viable as a bow choice over the Horn or Rus bow.
IMO, it should be a 5 PD weapon not a 6, since both the Rus and Long bow are more accurate and the speed difference between the Yumi and the Rus bow is negligable. Taking into account that it's only one slot, that puts it into the same class as the Horn bow which shoots much faster and more accurately (in my experience) and thus is a far more useful weapon (especially since the headshot buff). Conversely, the difference between the speed of the Yumi and the Rus basically isn't there, so why would you take an albeit 1 slot Yumi, when you can take a harder hitting bow with more accuracy?
This is the main problem with it I think, but it's probably set up this way because all weaboo weapons are either priced poorly, or made useless by their stats (i.e wakizashi). Either the Yumi should be more accurate, or faster firing or have it's power draw requirement reduced in order to make it an actually competative bow, rather than a style choice that most don't make because of it's uselessness.
My two cents.