Stringing Equipment I use
I use a Cadillac of the stringing industry.  A Stringway Machine.  Stringway Machines are made in Holland and imported to the United States through Alpha Machines in Austin TX. 

My Stringway machine is a constant pull machine. 
It pulls the string to the proper tension, then continues to pull as the string stretches.  If you have your racquet strung on a “lock-out” machine(such as a Prince Neos), it pulls the string until the machine’s mechanism realizes it has reached the appropriate tension, then stops.  As the string continues to stretch, it does not compensate.  This results in a string job which is tensioned 5-15% less than a constant pull machine.  A racquet strung on a constant pull machine will feel "right" to you sooner, with little or no break in period.

If you are playing with a Prince Speedport or O3 racquet, beware of people who string with lock-out machines.  The lack of true grommets will cause the "speedport" strings to be at a lower tension than the rest of the racquet unless specific precautions are taken.