Assembly was not difficult but tedious due to the amount of small screws needed to attach the vertical plates connecting the upper and lower basket brackets together. Sadly, there?s no dedicated voice assistant button like on the new Sennheiser Momentum Wireless M3, Jabra Elite 85h, Bose NC 700 or Sony XM3. 24 screws in total have to be put in - and 1 screw wasnt able to go in where the frame attaches to the wood. No weight to those towels so there should be no reason they came off so easily. 4GHz spectrum, is a welcome change, especially since my 570s would intermittently lose connection for a few seconds. My first pair lasted eight years of hard wear! It did the same thing with another pair of buds. Typically, the speaker responds perfectly to the + and - buttons. 5 miles in these over 7 hours up and down hills and stairs at the park) I would absolutely wear them again. Feels good that I can set down my smartphone at the squat rack, use the restroom (with wall barriers) the sound perfectly in tact.