Personally I like to see who is calling. Not anyone I know or need to communicate with I simply right toggle to "Ignore/decline". If it is someone I need to speak with I stop and call them back. Seldom wear headsets, so have to stop and call.
Just plug it into the usb jack and don't pair it. That is what I do. I had mine paired up but it seemed like it would ring at inopportune moments like riding home from work in heavy traffic and it was distracting. I rarely even talk on the phone in my truck while driving.