Given the fact I?ve had these less than a month says a lot about their quality and durability. This is what I have needed! Both 12 volt plugs and both USB chargers (all 4 combined ports) work great! I used two to hold up a small plastic step stool (about 8 lbs. I like the rubber sole underneath the sandals because of the durability. There seems to be some noise cancellation built in, as it has almost no background noise, but the playback of my voice sounds compressed. When it was time to use the bathroom I was hesitant but the wide opening allowed for easy use and absolutely no chafing at all! After that you might notice an additional problem, the long core inside resonates strongly at certain frequencies ( around 4 to 8 KHz ) like a reed in a wind instrument, adding a slight harsh sound to the music, to fix this I had to force back the remaining foam past the end of the core and cut around 2-3mm off, not easy. Naturally I share this with my woman because no man has enough shoes to fill this entire thing. lets see how this will last.