I know Markus from a seminar, so it is not possible to answer e.g. the questions about customer service, because the seminar did not take place in his office. What can be said, however, is that Markus knows exactly what he is talking about, shares his knowledge in an understandable way and also looks for solutions together (even after the seminar - and that is not a matter of course with all seminar leaders) or is available as a contact person after the seminar.
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