Ease of use: I'm a pretty savvy tech person, but these were hard to get paired. Seemed it didn't let me pair at all (wouldn't show on android or windows Bluetooth pairing menus) until after I connected in the SWARM II app. And the app wouldn't let me connect until I connected to the wifi dongle. I don't know what I would have done if I had wanted to just use these Bluetooth. 30 mins of trying got me nowhere.
Once I connected to the wifi to make the app happy, and updated the firmware it pairs fine now.
Music Sound: Meh... Little disappointed for the price. The preset defaults are crap. Using the custom EQ in the app I got it just "OK". I have a pair of cheap wireless gaming headphones I tried first (mic sucked on those so I'm trying these) and out of the box with no custom settings available they sound better than these on music. I'm a little bit of an audiophile so I'm picky. These are "thin". All the sounds are there, but the sound has no body to it. My cheap ear buds and cheap gaming headset overall sound more balanced and full. It's not BAD once you tweak the EQ, but I wouldn't choose them for music if I had other choice costing $70 less.
Function and fit: As most online reviews will tell you; these are tight. They are also a little small for my ears. I love how sturdy and well-built they feel, however. These seem like they will last a long time. I love the fold up microphone and how you can mute/unmute by folding it up or folding it down. I also love this type of mic design. I can't stand boom mics being in front of my mouth. I much prefer the cheek side design, so these fit the bill. I've read some find the control layout cluttered and confusing. But I honestly liked it fine. I also prefer the memory foam earpieces.
Noise isolation: Like most reviews state, these have little to no noise canceling involving your surroundings. It muffles sound from in front of you fairly well, but sound coming from the side or behind doesn't seem really muffled at all. This can be good or bad depending why you want a headset. I like them this way so I can hear people coming up behind me, and can be aware of what's going on in the house. Normal ambient sounds don't overpower hearing what you're listening to, but if you want to be an deserted island with these on... you won't be.
Other thoughts: I don't use these for gaming or listening to music. I use them so people can hear me clearly as I DM an online D%26D game. I prefer open mics and open speakers, but all my players complain they have terrible echo on discord and other audio platforms we've tried. So, I have to have a headset on. If I have to have a headset anyway, I want it to have a good mic. And in the price range this is the best rated mic setup around. With both manual controls and advance in-app controls for my sound and volume.
Overall: I gave 4 stars. For my use they are 5 stars, but for $99 most people I think would want better sound in music.