I really like the thick, soft footbed.  As other reviewers have reported, you can "fall off" the slipper.  I've found that simply taking care not to go fast, especially around corners, is all you have to do to minimize the issue.  If you see yourself having to sprint after a toddler, maybe this is not the slipper for you.  They are nice and warm but your feet can breathe.  I work in a home office and spend the day in my slippers, so this is important.  The thickness means that cold floors don't make your feet cold.

It may take a couple of tries to get them adjusted to your liking.  Do not adjust them whilst standing on them.  When you sit down, they will be too tight.  When walking, you sink down into them slightly.

My only complaint has to do with the Velcro.  The way mine are adjusted, a good deal of scratchy Velcro is exposed on the outside.  If you sit and cross your feet, the outside becomes the inside and your slippers want to cling together a bit.  This is pretty minor.  Less minor is a worry that I may not have all that much Velcro engaged and it may wear out over time.  Only time will tell.