Ordered this machine a few weeks ago, and already strung 10 racquets. It will pay for its self in 6 months. Everything is tight and adjustable. Came 2 weeks before it was supposed to. No special tools needed to set up. Came with a set of tools to get a beginner started. Not sure what the difference is between the 5003 and 6003, but the $400.
Now I cut out good strings just to try a different brand or tension. It's great.
Pros: Quality, Durability, Easy to Use, Good Value