Pietism produced many expressions and forms. In the end, Pietism was a rival/renewal movement in the centuries following the Reformed and Lutheran Reformations of the sixteenth century. I personally believe the post-Reformation produced a new type of scholasticism that help to reduce the flame of reformation to a flicker. Pietism is quite often seen by modern Reformed and Lutheran confessional adherents as a bad development. If you believe in church renewal and the work of the Spirit you should rethink this idea.