I have bought several (and I mean SEVERAL) bluetooth headsets over the last two years trying to find something that I really like.At the office, I was working on a training class where I had to wear a set of VERY old bluetooth headsets. After a few hours, my ears were hurting. We also had some very loud renovations started at my office. I decided to treat myself to some 'higher quality' bluetooth headphones. After much research, I chose these.I am not disappointed at all. In fact, I am ecstatic with my purchase. These things are so comfortable. The Active Noise Canceling is amazing for the price! I have two VERY loud fans running in my office. With just the ANC turned on and no music playing, the fan noise is about 95% GONE. With music playing at a very low volume, I cannot hear the fans AT ALL.Most of the very loud construction noise is gone too. I have to lift one of the muffs off my ear to see if the workers are still present.These use bluetooth 5.0 and can pair with more than one device. I paired them to my Samsung Galaxy S21 Ultra and listened to some music. AMAZING sound!I then paired them to my Windows 10 Pro computer and listened to some music. It sounded so flat. I was very disappointed but realized it's not the fault of the headphones, but the computer.I refuse to pay Microsoft for the Dolby plug-ins and the sound card that is in this workstation computer has no equalization whatsoever.I set out to find a FREE, good quality equalizer. I found a free open-source equalizer called Equalizer APO 1.21 and also downloaded the free, "Peter's Equalizer APO Configuration Extension (Peace) 1.6.1.2" to manage it. These headphones now sound absolutely amazing plugged into my Windows 10 Pro work PC!The real test on if a product is good is if the customer would purchase them all over again. The answer for me is YES. I am going to buy a second set for the house. (I registered for the 24 month warranty at Cowins website. They are supposed to send me a coupon for 20% off my next order. When that comes in, I'm buying my second pair!) I intend to buy them even without the coupon though as the email with the coupon link goes to a site that says 'link invalid'.I gave these 4 stars instead of 5 because the controls are few, but a bit complicated (especially when I want to connect to my computer, but wind up connecting to my phone because the bluetooth is on for something else.) Also, this uses a USB 2.0 A type connector to micro-SD connector for charging. I would expect USB C on both ends, in this day and age.The bass is super powerful (but sounds great) on these. I'm not big on base. The equalizer I installed on the Windows computer allows me to turn it down and adjust all of the other frequencies I like. The important thing is that these Cowin E9 headphones can produce these frequencies with no problem whatsoever. You won't be disappointed with these!I love these headphones, especially for the price! They connect to my phone and laptop, which I love! My only complaint is that they are just a little too big, They adjust but not to go any smaller. I noticed when working, if I bend down or look up, they will start slipping off. But, if you're a student, I highly suggest getting these!The noise canceling is really good, sound quality is almost as good as my Bose headphone, clear and nice base.My neighbors recently installed a heat pump/air exchange unit between our houses, about 6-8 feet from our wall that's on a slope between main floor and basement. That unit runs for HOURS (not an exaggeration-got home at 4 the other day and it was still running at 10, with only a 10 minute break) and sounds like a rough engine idling between and beneath our house and is audible at different frequencies throughout the house, driving me batty.I just received these yesterday and tried them when I got home from work. It's borderline amazing. I was sitting on the couch with a small, personal fan blowing, the washer/dryer running, and the neighbor's noise too. Couldn't hear any of those, but could still hear my tapping on my tablet, and could hear the baseball game on TV with only turning volume up a few notches.I have never used noise cancelling before, so nothing to compare these to, but the didn't hurt or become uncomfortable, no headache. Had to remove them to remind myself why I was wearing them. Briefly tried pairing to an ipod touch and sounded great.So far so good!Great Product for the moneyMy wife likes the music she loves it.Try them listening to streaming music from my phones. Sound with noice cancellation on is enjoyable. Bass is present but not overbearing. Mids and high are acceptable. Comfortable to on head and ears. For the price not bad.I really liked the package. The design the knowing that if I needed something, customer service would be there. It's a great product and I would recommend it to anyone looking for a good, solid and reputable company.