Exploratory testing: good or bad for a project?

Exploratory testing has been used in large companies such as Google and Microsoft for a long time. However, this approach is controversial, it has many followers and opponents. And, moreover, it is seriously different from the approach to which many got used to. In iTechArt, we decided to take a chance and apply it in the testing of real projects. I'm going to tell what results we have got, what difficulties we faced.