I have used this headset with both an Env3 and a Droid. It replaces a Jabra VTB2050, which I liked very much. The sound quality on my end is comparable if not slightly better. People that I call regularly have reported that they hear me more clearly and that the background noise is significantly reduced. Functionaly it is a little more complicated than my previous bluetooth, but pairing has been simple with both phones. Battery life has been excellent. It has not died on me yet during even very long full days of use. I was a little concerned about the comfort and look of the thing while being worn, but found once I put it on that it was quite comfortable, and not nearly as Borg-implant looking as I had expected. It is also very secure. It has not fallen off at all, which the Jabra did even with the ear clip in place. The only thing I have noticed about its size is that after wearing it for more than 12 hours strait, the back of my ear can get slightly sore.On the whole I am very pleased with this headset.