Straight from the horses mouth:


"There are two main differences between the Enthusiast and Professional Kits:

1. The number of cars supported:
   The Professional kits support an unlimited number of cars. The Enthusiast kits support up to three cars only. The limitation of the Enthusiast kit is based on the car's VIN - not model.
2. The Coding and Command Console features:
   
   Beginning with Durametric version 6, Durametric supports the Coding and Command Console features. These features are included with the Professional kits only.
   • The Coding feature provides for the ability to enable or disable predefined features in the car such as airbags, daytime running lights, cruise control, and the rear spoiler where applicable.
     The Command Console feature is a means of communicating with the control units using very low-level communications. This feature is very seldom used.

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Here's a link to the Planet9 tutorial on using the Durametric Enthusiast Kit:
http://www.planet-9.com/reviews/elec...he-basics.html