Ive named the multi-electrode array with a human brain The Singularity Genus (Syg).

Some pros and cons of sygs:
Pros:
They can be used in various applications such as working with game programmers or movie studios doing motion capturing work.
They can work with scientist to understand how our brain works to someday build a real AI without any biological parts.
Without the needs of a body a syg can use its vast computing power and resources to research and cure various human ailments such as aids and cancer.
Some sygs might opt to work as virtual warriors and combat against computer viruses, completely wiping them off the internet.
Sygs could be sent into space for longer trips then a human astronaut could, they could land us on Mars and do research in that harsh environment.

Cons:
Yea its possible there would be rouge sygs that would harm our computer infrastructure. Those that did it would have to be kept in solitary off the internet.
If religion is right and God exist... would we be punished for playing god like this?
Sygs would be taking jobs away from normal humans if they were exceptionally good at making new software/games/cgi movies/etc

list your pros and cons if you want