I can get quick support from experts in domain where I know no-one, and this support is then available for everyone else. So if someone already asked for the same as I, I can find answer to my question in already answered questions.

It works similarly like helpdesk/support in our corporate, but seems like much more efficiently, without creating unnecessary overhead, and also quicker. Because it directly notifies an expert in relevant domain if a question is asked. Review collected by and hosted on G2.com.

Can't really find a disadvantage of this. I also personally contribute as an expert in my own field. Perhaps the searching can be enhanced with filtering options. Review collected by and hosted on G2.com.