I am a former owner of the previous generation Motorola HT820's, and these were a welcome update. I pair them with the Nokia 5300 Music Xpress phone. Here are some subjective pro's and con's:Pro's:- Very unassuming compared to other BT stereo headphones out there- Reliable connection for the most part (uses Bluetooth 2.0)- When in non-noisy environment, other party can hear you very clearly.Con's:- Tough to hear audio in noisy environment. Uses earbuds that don't go completely in ear and don't provide necessarily suction like over the ear headphones.- Only allows you to hear voice on 1 side (HT820's allowed you to hear voice in both ears).- If your device is not in line w/ headphone can suffer from typical connection problems, though it's an improvement over the HT820's.Conclusion:Overall, these headphones provide the best combination of style, comfort, and performance. Other headphones may excel on certain points, but these all around win out.The best environment to use these headphones are:- Gym- Jogging- Home- Commuting (train, bus, plane)- Any place inside with mild ambient noiseThe worst environment to use these phones are:- While cycling (too much ambient noise due to traffic proxmity)- Any place where there is moderate to excessive ambient noise