Good idea, but wow, the popup mechanism is obnoxious. It needs to be off to the side in a fixed location that doesn't obscure what you're looking at, or make you chase the 'Hide' button with your mouse.
Also, I usually use the filters first. Say for laptops, I set the screen size to >=12inch and the weight to <=3pounds. So there ain't that many items left on the screen.
Do you use it differently?
I saw the "big grid" and was curious, so I hovered on the icons, moving along a line, just to get an idea of what the thing does. Doing that, I kept accidentally moving the mouse pointer off-axis so it went into the popup, and was "stuck" there, until I dragged it outside the popup again, and promptly lost track of what I had already glanced at.
"Click to hold" isn't a good name for the feature, but hopefully the idea makes sense.