You may be surprised how much their doctrine and life has in common with some of the Charismatics (tho' not the "Profit Driven Church" /Three Ring Circus Feminist Evangelicals which seem to have supplanted many of them).
I may have learned more about Pentecostalism/charismania from those not part of my precise Christian sub-group than I have from my co-religionists.
There's a Chinese proverb that the onlookers see the game the best.