14" is too wide and there is not enough suction to pick up the debris in the corners. The 12" works much better to get in the corners.
just o.k. bristles are too soft.
I would rather have the previous one.
Here is why I dislike this:
The grooves on the top catch dust and dirt. Very inconvenient to clean.
The side edges do NOT suck up the dirt when pushed along an edge. Very, very disappointing.
The hairs are too long.