I think Greg Richter and Rick Price would agree that .66 mv per degree per second +/- 20%
would be near useless.
Paul Lamar

Remember that the output from a rate gyro gets integrated over time to derive an angular position.  Any errors in the rate gyro become greatly magnified and must be removed by correction methods (i.e., long term sensing of a gravity vector, detection of magnetic fields, detection of GPS attitude, etc.).  A rate gyro with a 20% error rate just wouldn't cut it.  The spinning mass position gyro is really a pretty amazing device, very hard to duplicate its function in a strap-down electronic sensor.
Rick

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