The 3D sound field is realistic. Cradled my sit in kayak perfectly. It does have a short piece of plastic to stop a stacked one from slipping off the groove which is good. Doing this has worked well so far. I love the home slippers with ultra-soft faux fur lining , very cozy looking. Two over my favorite features are that you can charge one of them while still listening to the other one. I dont know whether I got a defective since other side seems to be still sturdy. One of the screws that I installed i struggled with putting them in. I love my FitFlops they fit as I expected them to. If youre like me, do stock up on these!