One Ragged Hole Sight on Original PC9

Has anyone tried the One Ragged Hole rear sight on a 1st generation PC9? I recently bought one and unfortunately it wasn't the ghost ring sight model. I couldn't pass it up though, since it came with 18 factory mags and 5 aftermarket hi-cap mags :shock: :shock:

I don't really want to put an optic on this carbine, but the basic factory sights leave a lot to be desired. Just looking for some first-hand experience/opinions. A link to the sight is below:
http://www.warrencustomoutdoor.com/ohs-ruger.html