The best part of this software was its ability for me as an individual user, not only could I see what my competitors were doing but also how they did it! This helped tremendously in terms of being able to learn from their mistakes or successes so we can improve our own business model/strategy accordingly.
It's really difficult to find any downsides with Intellinode at all actually - maybe if you're looking into having more than 1 person working within your team then there may be some issues around managing multiple users (but honestly though even when i had just myself running everything worked perfectly). We used intelli node primarily because we wanted access to competitor pricing information without needing them to share theirs openly which would have been unethical due to privacy reasons etc.