BlueAnt Z9i Not So Good

My Plantronics Explorer 220 has no noise reduction and people cannot hear me in my car. I got a BlueAnt Z9i to try and solve this problem. It seems to solve it, but I have some major gripes with the Z9i:

1. It does not sit reliably in my ear.
2. It has an annoying high-pitched whine all the time.
3. It does not put out sufficient volume with my Blackberry Curve.

Back it goes. Wish I knew which Bluetooth headset would work.