I just did our downstairs. I used Lowes smartcore ultra blue ridge pine color.
It is 100% waterproof, does not expand or contract with humidity, instructions have no mention of keeping a gap between floor edge and walls, like they do with other kinds of flooring.
I removed all base boards.
One trick in hallways and doorways, cut the piece so you know it will fit, then slide the piece under the floating floor, and bring it up into position around the doorway and lock it in. The doorway side molding, I did not wish to remove and when your finishing the last row, there is no way you can clear it any other way.
And if you have trouble getting pieces together, you can somewhat warp it to start it fitting into the slot, and on long rows, if you get the end going in then keep on tapping it down the entire plank and it will slip together. I had several small cut offs I locked into planks I was tapping to fit, and of course the flat black bar. I used a 3 lb sledge hammer to whack things together. You will know your fully together, when it is fully flat and tight, no light colored seam showing on plank edges.
I like it a lot, it is very flexible, so it conforms to the floor. It has texture ridges in the surface.
One thing, be careful to make sure edges are locked tight. I had to fix an area because I had not locked planks together all the way.
That was not fun pulling out flooring pieces.https://www.lowes.com/pd/SMARTCORE-...-Locking-Vinyl-Plank-Flooring/1000196679