I have used the Plantronics Voyager for a few months, exclusively for work. The headset is directly connected to my computer via Bluetooth (I use the native BT of my PC, but you can use the USB device as well) and every time I pick it up, the connection is instant. I love the noise cancelling feature as I work in an open space. The transition with your phone is also very smooth and the mic is working perfectly (no client complained about not hearing me well). I don't know if it's standard now or not, but it's cool too that the music starts and stops when you pick up or put down the headset.
One 'bad' design feature though: it hurts a bit after one hour of use if you wears glasses.