My feet require orthotic shoes/sandals and it is uncomfortable to go without shoes any longer, unfortunately.  I am also difficult to fit because I have a wide front foot and a thin back foot, a deep arch and healthy bunions.  It's often difficult with sandals to know weather to order a 7 or 8W or M for my 7.5W tennis shoe foot (with socks).  I ended up keeping an 8M after trying all variations in this sandal: 7M, 7W, 8M, 8W.  Much of the reason why is because of the deeper heel pad for this sandal, which definitely adds to the comfort and you really want your heel sinking into this for max comfort.  Oddly, with this sandal. regardless of size, the toe room was/is very generous.  I'm hoping I don't trip over these like I do another pair of size 8 sandals.  The toe separator of this sandal is uncomfortable and I'm hoping it settles down after wearing; it is starting to a little; it is requiring some breaking in tho.  Also, these tend to sweat a bit, or maybe I just need to get use to these as I've been wearing a leather footbed sandal.  Overall, they are comfy and I needed a new pair that can get wet.
Update: It only took a couple of wears for the toe separator to break in; also I am not tripping over the generous front portion of the sandal.