While this doesn't compete with higher end bluetooth headphones in sound quality or comfort, it's certainly good enough for budget conscious individuals, especially if you're looking for a longer lasting battery at a reasonable price.Comfort wise they're adequate for a few hours of use but there's a bit of clamping force which could discomfort those with larger heads. Build quality is alright for this price range as it feels that it will withstand a few drops and daily use for at least a year or so. I reckon changing out the pads would help with comfort as with other headphones.Sound quality is just mediocre. I always prefer a warmer sound signature since I listen to ASMR whispering videos and live npr tiny desk sessions so I didn't like the sound quality on these headphones unfortunately. The sybilance was easily noticed in various youtube podcasts and the sound just wasn't full bodied. However for casual music listening these would work fine.The bluetooth connection works well and auto-connects when turned on to the last device it was paired to. I have used these with an Amazon 4k Fire Stick as well as my Acer laptop with no issues noted. The audio sync lag is minimal though I haven't seen aptx specification so there will be some lag for videos.Overall though the sound quality is mediocre and the comfort-level is just ok taking into account the price I feel a four star review is justified. Bluetooth 5.0, a 20 hr+ battery, and type c port at this price is certainly compelling.