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Personally I have found that the performance and memory profilers have been worth their weight in gold. Especially when building enterprise grade applications. I've never actually used the FlexUnit testing, so I can't help you there, but I thought I would weigh in about the profilers, as they can make a huge difference in your applications.
Thanks for your question about Flash Builder Premium.
Flex Unit support in Flash Builder relates to the following capabilities:
* Create unit test cases and unit test suites (Wizards guide you through the creation of test cases and test suites, generating stub code for the tests)
* Run the test cases and test suites in Flash Builder
* Navigate directly to source code from the Flex Unit Results View
You may find this article on the Adobe Developer Connection site useful: http://www.adobe.com/devnet/flex/articles/flashbuilder_tdd.html
In relation to support for automated testing, Flash Builder Premium comes with the required libraries for you to be able to use automated testing tools with your Flex application.
You will most likely want to use a third party tool, in addition to Flash Builder, to undertake automated functional testing. Information on the Flex plug-in for HP QuickTest Professional and supporting documentation is available here: https://www.adobe.com/cfusion/entitlement/index.cfm?e=flex4_automation_plugin
As someone else pointed out on this thread, another important tool included in Flash Builder Premium is the Profiler; you might also benefit from the Network Monitor (which enables you to watch network traffic between your Flex application and a remote server) in the Premium edition - more information on those features can be found in this article: http://www.adobe.com/devnet/flex/articles/flashbuilder4_debugging_profiling.html
I hope the above information helps with your decision.
Senior Product Manager, Flash Builder