The provided information does not directly relate to "Progress Services" as it seems to be a different entity from the well-known Progress Software Corp. Without specific details on Progress Services' activities, services, or target audience from the given URLs, it's challenging to provide a precise summary. Typically, a company's unique selling proposition (USP) would be identified through its website and LinkedIn page, but these details are not available in the search results. If Progress Services is a distinct company, its USP would likely be based on its specific offerings and market positioning, which are not specified here.