Having tried a number of similar services in the past, we were very pleasantly surprised as to how good the content extraction is. The contacts we have dealt with at Diffbot have also been extremely helpful.

The KG is amazingly comprehensive. Products, people, corporations, and more all linked together in a contextual way. KG provides a user friendly way of feeling like you've scraped the whole web. No custom scraping rules, no need to figure out the nuances of where information is housed online. Just query and see if what you're looking for is on the public web. Finally, export features are great. You can export to CSV or JSON. I believe there are also a host of APIs where you can extract data on different entity types.

The parsing quality is best of breed - and adapts well to all sorts of websites