I used this headset for about 3 years, first using it on a t289, then upgrading to a t6400. It was used as a convinient way to listen to radio broadcasts in a crowded situation and with a touch of a button, I can easily respond to any transmissions I need to.
The only con about this product, is that sometimes I forget that there's a mic near my mouth. Case in point, when I drank from a water fountain or from a cup, sometimes the liquid hits the mic before my mouth, but after numerous times doing that it still works, picking up my voice whenever I press the button.
I did try it with the VOX option on, but since I'm a heavy breather it always sent my breathing over the air to other users, so I learned to disable that, but it didn't interfer with my usage of the product.