Excellent with only one minor flaw.
These are fantastic slippers. Nearly the best I've ever had. Super warm, fit true-to-size, and very high quality construction. Structurally they will likely last for years. The only issue I have with them is that the insole isn't replaceable, like most high-quality shearling slippers out there. Once these get packed in and dirty, they won't be much use, and even though the slippers will be structurally sound, they won't feel as amazing as they do when new. And since you can't remove them, you can't brush them out to get your fluff back. It's a simple thing to make the insole replaceable, and if these were like the other brands, I'd give it five stars and say it's the best pair I've ever had.
And regarding those who complain they are too tight in your normal size, everyone's feet are different, but slippers like this always feel tight when you get them. After two days of squeezing into them, they adjusted properly to my shape and size, and now they fit like they were made just for me, and in my normal shoe size. Unless you have a really high instep or a really unusual foot shape, order your normal size, and be prepared to break them in. 👍