This headset cleared up some problems with my Motorola V3xx. I had some problems understanding callers with the phone due to the speaker sounding very garbled with too much low frequency. This headset fixed that with a clear and bright sound which is audible in high noise situations around heavy equipment. The noise cancelling feature also lets callers hear me clearly over background noise. All of the voice features of the V3xx are improved when using this headset, too.The headset sometimes feels loose, but it has never fallen out even when jumping on and off of tractors and trucks. I wear glasses and have had no problems with the fit of the headset. It is also quite comfortable even when it is worn all day. It also fits nicely inside a welding hood.Everything about this headset is first rate. Battery life is great. Recharge is quick, too.