There are no difference regarding the manual trading and robot in such a way that the robot will attain to us more profits. Even the robot seems to be adding more risk tou our trades in the sense that there could be some malfunction or the user not having the adequate knowledge for it.
Automated trading programs only implement the strategy of a trader. Only advanced programs (genetic algorithms and neural networks) have the ability to learn and mimic human brain. Even then there is every possibility of error. The best of the traders in the world are not programs but humans who can think very quickly and adapt to changing conditions. Thus, it is always better to use programs only when we can build it ourselves as per our own strategy. Using an unknown robot will only make us uncomfortable. Even in the case of loss, there is no possibility to introspect.