I Think Best for Light to Moderate Cleaning
This spray mop is okay for light to moderate cleaning.  I like it because it's easy to put together plus I can use my own cleaning solution (50% vinegar and 50% water).  The mop head, which is a large flat pad that attaches to the bottom of the mop, is large about 15.5 inches in width.  This comes with 3 mop heads.  An interesting feature is a plastic comb-like tool that attaches firmly on the mop handle for cleaning the mop head or, as suggested, cleaning tough spots on the floor.  To be honest, I use a mop so hopefully I don't have to bend over and clean much on the floor.  On my floor, which was quite dirty, I did have some spots that I cleaned using another scrubbing item I already have which is why I state this is mop works best for light to moderate cleaning.  The cleaning solution bottle is easy to use.  It just pulls out where it fits in a position that to me seems upside down.  The bottom is a small plastic lid which twists off.  When filled with the desired solution, it just goes back on the mop handle.  I found it does take a small push to get it properly fitted into place.  To spray the solution when mopping, there's a trigger-type lever on the top part of the mop handle.  The solution sprays out several inches in front of the mop so care is needed if one doesn't want to get woodwork, doors, and such wet.  My rating is 3 stars for this is not cleaning as effectively as I hoped for especially with the roughness of the pads which should have helped with 'scrubbing.'
Rating: 3 stars