Using encoder with talon SRX

[riftware]

Ok - so I got my hardware setup. I have 2 talon srx's setup with 2 of the optical encoders from andymark. I created a test button and added the following to the execute on the command for the button. It starts and stops the motor but I'm not sure it is really doing what I want. Basically I'm working towards a command that will cause the robot to travel forward x inches to be used in autonomous mode. The code below is what I used...the position on the encoder doesn't seem to wind up anywhere close to where I expect it to be also I think I'd have better results if it was running slower or there was a load on the wheel. The output from the print statements is before the code for ease of following. Obviously I'm totally overlooking something so any guidance is appreciated.


Start of Execute
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    	System.out.println("Start of Execute");
    	RobotDrive drive = RobotMap.driveSystemdrive;
    	CANTalon talon =  RobotMap.driveSystemCANTalon1;
    	talon.changeControlMode(ControlMode.Position); //Change control mode of talon, default is PercentVbus (-1.0 to 1.0)
    	talon.setFeedbackDevice(FeedbackDevice.QuadEncoder); //Set the feedback device that is hooked up to the talon
    	talon.setPID(0.5, 0.001, 0.0); //Set the PID constants (p, i, d)
    	talon.enableControl(); //Enable PID control on the talon
    	int currentPosition = talon.getEncPosition();
    	System.out.println(currentPosition);
    	talon.set(5000); //Tells the talon to go to 5000 encoder counts, using the preset PID parameters.
    	System.out.println(talon.getEncPosition());
    	finished = true;