Is HR learning from their external Customer Poll ?

In large organizations Sales, Marketing, Support and R&D people constantly learn from their customers while employees in the shared functions are usually less exposed to outside customers.
In the last years especially in Human Resources it was advocated by the leading HR Gurus such as Dave Ulrich for Human Resources professionals to get more exposure to the external customers of their organizations.
In my one question poll I am asking now if you as a HR professional have ever been invited to visit your external customer.
The link to the poll question.
Thank you very much for your kind support.