I have two pairs of the runners now, the grey (shown in Sterling's pic) and white. I had to size up -- I am usually a 6 or 6-1/2 but a 7 works for me with Allbirds. I don't find they stretch that much: my first pair was a 6 and I wore it a lot, walking everywhere, and it didn't stretch. My toes were rubbing and the arch felt off. Sized up to a 7 and they fit much better.
I wore the grey pair hiking in Sedona. I am now wearing the white pair a lot for Spring. I find these are SUPER comfortable (without socks, even). They make my feet so happy.
As for the loafers, I bought my kids those for xmas. I gave them a choice of runners or loafers and they both wanted loafers. I don't personally care for the look of the loafers for "outside" shoes, but my kids do wear them that way (one is a home health aid, the other a teacher's aid -- works for their professions). If I was a slipper wearing person at home, I would get a pair of the loafers, but I just wear socks.
Have yet to wash mine but consider their washability a plus.
I would like to try the skippers next, as the Allbirds (being wool) do get too hot for summer wear. I am just worried the skippers won't be as soft and comfy on bare feet?