Given the number of people who register a trademark without realizing it and then run into legal problems down the road, I think the feature is a great idea. Unfortunately, the site only checks against 1000 companies or so and their products. It also will detect trademark typos (such as Microsooft or Aple) and estimate the litigation risk of registering a possibly trademarked name.
Keep in mind that this tool is completely automated and not in the least comprehensive. If you plan on investing a good chunk of money in a domain or online business, you would be wise to speak with a trademark attorney for the best advice.
Source | Domain News