You have a round piece secured down to a flat piece (seen in one of the images), so that was a flaw that could easily be fixed by including a small plastic or rubber spacer that can fill this gap slightly and adapt the shapes. The goods arrived far quicker than anticipated, well before the suggested deadline, but proved to be the incorrect size! Construction and setup were easy though, and I havent had any problems with it aside from what Ive stated. Unfortunately now that Ive worn them outside, I cant return them. Crocs sizing chart provided is super useful to reference to so you shouldnt really go wrong. And we are both very happy! I wear size 11, finding sandals that have comfort and a bit of style at a reasonable price is difficult. He walked me through changing a few settings and wanted to test the settings that were changed by calling me back (thats a nice thought) to ensure everything was working ok. Tried it out with my supervisor and she said my sound was very clear. not like reverb wise but just like these are regular speakers I am listening to with something in the way of me and said-speaker.