What are the best practices for using the enhancement framework?

Hello enhancement framework experts,
Recently, my company upgraded to SAP NW 7.1 EhP6. This presents us with the capability to use the enhancement framework.
A couple of senior programmers were asked to deliver a guideline for use of the framework. They published the following statement:
"SAP does not guarantee the validity of the enhancement points in future releases/versions. As a result, any implemented enhancement points may require significant work during upgrades. So, enhancement points should essentially be used as an alternative to core modifications, which is a rare scenario.".
I am looking for confirmation or contradiction to the statement "SAP does not guarantee the validity of enhancement points in future releases/versions..." . Is this a true statement for both implicit and explicit enhancement points?
Is the impact of activated explicit and implicit enhancements much greater to an SAP upgrade than BAdi's and user exits?
Is there any SAP published guidelines/best practices for use of the enhancement framework?
Thank you,
Kimberly
Edited by: Kimberly Carmack on Aug 11, 2011 5:31 PM

Found an article that answers this question quite well:
[How to Get the Most From the Enhancement and Switch Framework as a Customer or Partner - Tips from the Experts|http://www.sdn.sap.com/irj/scn/index?rid=/library/uuid/c0f0373e-a915-2e10-6e88-d4de0c725ab3]
Thank you Thomas Weiss!

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