I tested this headset against the Motorola S9 using a samsung A717 phone from AT&T.; Main use is to be able to ditch a separate MP3 player and just use 1 device + eliminate wires. Mission accomplished! Very easy to pair both devices.As compared to the S9 this headset way outperforms the S9!The S9 only has PHONE capability in the LEFT EAR, HT820 is in both ears!COMFORT--HT820 = Awesome, S9, not very. You can't lay on your back on a pillow with S9--HT820 you can.FUNCTIONS--HT820 = Very good use of large buttons (left answers a call, right will pause a song. S9 you have to feel around a bit more, but may get used to.SOUND QUALITY--HT820 = Excellent with Stereo MP3 audio & Very good with phone calls on BOTH ends. S9 SLIGHTLY BETTER sound on MP3 audio, HORRIBLE on CALLS, worse for the person you called, like a bad speaker phone.DESIGN--HT820 = comfortable but in a dark room YOU'LL resemble an alien out of Star Wars! S9 much more socially acceptable! PS--Don't try using the HT820 in dark locations if you want to remain inconspicuous. You WILL light up the room & probably annoy others.There you have it. I would have given it 5 stars if the MP3 audio was slightly better/equal to the S9--It's close, though.