That's nice, but...
Having reviewed/researched many of these "cross platform" applications to support migrating customers, Transitive as a tool is nice, but in the real world, there's no support for your typical "Off-the-shelf" application. So, this aids in migrating home grown applications, but is relatively useless for your typical Oracle, SAP, or other "common" application.
We've found that recompiling the application for the new environment or leveraging the available application (when it exists for the new environment) is the best way to go.
Also, in the best case, you can migrate an existing license to cover the application running on the new environment. In the worst case, you are forced to buy a new license. You have to compare this to the support costs that you are paying for the current environment.
In the end, I have found none of these tools to be the "Holy Grail" that some people tout them to be. Like any tool available to you, you need to properly evaluate the true feasability and ROI.