I did some research before purchasing these headphones, with the majority of them giving the Jaybirds good to great reviews. Straight out of the box these ear buds fit perfectly; they provide several pieces to help get you the right fit if you need to make adjustments. I would highly recommend downloading the Jaybird app before getting going, it'll guide you on how to set up your device.
I had a little hiccup with connecting my bluetooth, but learned how to reset the earbuds through the app. Once reset, the Jaybirds were ready to go and worked great. You'll have some sound adjustability through the app but don't expect a tremendous difference in customizing the low, mid, and high ranges. You have two options for button controls on the ear buds themselves, which would be better if you're able to adjust volume AND play and pause your music within the same control function. Outside of better button controls/ options, the Jaybirds are great.