The 9292 OV is an application with a website and an app. It is useful for all sorts of public transport:
it will definitely get you from A to B. It has realtime information about traffic, delays etc. Usually it knows of delays earlier than the official applications. It is a one way communication app; there is no feedback or information from the people involved. The concept has potential to green the environment, as it encourages people to utilize public transport, but this is almost moot in the Netherlands since a large portion of the country already relies on public transport.
Try it for yourself, it really works!