The draw bias driver is designed to curve ball trajectory to the left. The typical design has a closed clubface of -2 degrees or greater and a weight distribution that moves the clubhead center of gravity towards the heel and hosel. Look down on the draw bias driver at address and you see a club that faces left of the target line (for RH golfers).
The only purpose of a draw bias driver is to counteract a slice, a common tendency among mid-to-high handicap amateur golfers of hitting the ball on a trajectory that curves excessively to the right. The underlying causes of a slice are usually thrusting the pelvis towards the target line or a poor address position that favors a flat swing.
The primary effect of a draw bias driver is to help lock in the underlying range-of-motion faults that cause the slice. Another significant undesirable effect is to tilt the spin axis of the ball towards the left, causing excess "side spin" and loss of distance. Playing strategy on fairways that have a dogleg to the right is adversely limited by a driver that always wants to hit the ball the left.
Our advice is to avoid playing any driver with a face angle or weight distribution designed to push the ball left or right. Avoiding drivers longer than 45 inches will help you improve your address position and benefit your swing mechanics. These two simple considerations will help you select a driver that leads to better performance on the tee.