I've owned these slippers now for a few months, and so far they are working out well.  Very comfortable, warm and seem to be holding up.  The wool inside has compacted, but that is to be expected.

About sizing, there are mixed reviews on here as to whether or not to upsize.  Originally I chose not to, but I chose poorly.  I wear a 12 wide shoe and I had to return the 12 W slipper for the 13 W.  While it's true the wool inside would have likely condensed over time, it also comes down to how you like your slipper... snug or roomy.  I like mine roomy.  The 12 was just too snug.

This is a great slipper for wide feet.  The wide width is wide.  Trust me, my feet are so wide I can walk on water.