Walking with these feels close to barefoot, except you have a thin, very flexible, dense rubber sole. The straps are good with keeping it feeling secure to the foot, and let you tighten or loosen in different areas for a good fit. The front of the sandal will need a slight amount of looseness so your toes are comfortable. That's the only drawback with them being sandals.
The heelcup in the back can be a little noticeable if your foot starts moving into the side of it, so you might have to experiment with getting the fit how you want it, but then it's mostly easy to just get on and off with the heel strap. The heel cup also has a benefit of letting you use a shoe insert or insole without it moving around, if you want to. It can also be cut off to save weight, and the sandals have some weight for their size because of the rubber density which is supposed to be long lasting.
The all rubber soles can rub the feet some, which can make it harder if going a long distance, but can also help with getting the skin more tough overtime, then maybe trying some true barefoot. When running you'll have to pay more attention to not over striding to reduce the rubbing. Small rocks can also get in the sandal when hiking, but it's not very bad with the flexible soles.
They're very comfortable sandals for walking around, work for regular running, and have the benefit of not having an upper that traps moisture. For sprints and other movements, a full shoe or Vibrams may be a better option...
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