Other than one being wildly expensive and like doing a stint in Supermax? Just kidding…
The main difference between Carlson’s maintenance plan and Autodesk’s subscription is that Carlson’s tech support is not tied to maintenance at all while Autodesk tech support is only available for no additional fee to those who are current on subscription.
Also, in the past few years, there have been so many changes to Autodesk’s Subscription policies that it’s practically impossible to keep up and know exactly what you’re getting for that big price tag.
Regardless of whether you’re current on maintenance, whether you’ve let it lapse, whether you’re using today’s version of the software or whether you’re using a version that’s 10 years old, tech support is free from Carlson.
You can view the Carlson Software Maintenance Policy here