I really don't want to have an implant in my head for people to "keylog" or pop up spam, et al.
However, this could really benefit medical science by giving the physically disabled a means to work computers more easily. Not only that but this technology can be used in medical science. One could control a prosthesis or other equipment with much greater control. Accident victims and soldiers who have lost limbs may even be able to regain near 100% function, even with something as intricate as a working hand. People with debilitating diseases or conditions, Stephen Hawking comes to mind, would be able to enjoy much more independence with the right equipment being driven by their still very capable mind.
While the potential for abuse exists and must be guarded against, I see the potential benefits making this technology worth pursuing.