I also have the NC25 and I keep it connected to my tablet so the NC35 can stay connected to the TV. My wife doesn't like her because I can't hear her calling. :-) I mainly listen to classical music, including a lot of organ, and they do a great job. These are also my zoom ears when I'm out of the office and they work great for that. As I wear them for long distances, comfort is important to me and most of the time I don't realize I'm wearing them. The range is also good. The main difference between the two models that I came across is the charging port. The 25's have mini-USB and the 35's have USB-C. The carrying case that comes with it is good and I use it for travel. Update after a year. I still love it but one of the pads just ripped and I can't find a replacement. My two year old NC25s are still fine.
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