... large company
located in an English-speaking country and you want to make sure your marketing communications are appropriate to both the German-speaking market and the target group (B2B, B2C).
... large company
located in a German-speaking country and you sometimes need a little extra marketing support in addition to what your lead agency provides.

... medium-sized company
and you don't want to approach a large marketing agency for every single mailing and product flyer you produce, or you need specific project-related support.

... small company
with no inhouse advertising department and you need effective marketing support and genuine service at reasonable prices.