Floor is all about bass guitar and kick drums—you can sculpt and tighten the lows in a very useful way, and/or throw in midrange impact. It works kind of like Density/Drive, but when used to control subsonics the wet channel suggests more lows.
That’s by design: it’s one of the ‘simulate added bass’ plugins like MaxxBass etc. which generate harmonics to imply a fundamental. If that’s the kind of thing you tend to need, Floor ought to be useful, and it is a freebie so there’s no reason you can’t try it out.