I have no opinion really, I don't know how many of them experienced anything and how many just said they did. Unguided, regular meditation can be harmful for people with preexisting mental and even physical conditions, it is that easy to induce things on your own, so what kind of effects can be produced with meditation guided by guru who want certain things to occur? Look at pentecostal movements in christianity, what charismatic leader can do to the whole congregation.
Anyway, answering your question from the title, I would ignore it.