I've had zero issues with my Vintage Air Front Runner's power steering pump.
However, one small nit with all of these aftermarket drives is that to make them fit in virtually any engine compartment they bring the accessories in as tight to the front of the motor as possible. All of them put the alternator right in front of the cylinder head. Having the voltage regulator of your alternator within 1/2" of the head with poor airflow is really hard on the alternator.
I've killed a few regulators in extended autocross sessions. Never a problem on road course or street driving.
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