This is a very interesting, candid discussion/debate between Phil Johnson and Michael Brown concerning the claims made especially by John MacArthur at the Strange Fire Conference. When Phil gets the chance, he does a good job of challenging Michael.
Although I have myself criticized John (here) for painting with too broad a brush in his own criticisms of open-but-cautious men in Reformed circles, in the main I agree with the warnings being issued against the Charismatic Movement.