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Fr Ripperger was ordained in the Novus Ordo sect ( FSSP?) so his ordination might be considered doubtful. In the past he called the neo-SSPX and all other independent trad groups schismatic.
He hasn't spoken much about that lately ( understandably). He seems quite proficient in his ministry of exorcism but I am surprised he is so visible online with his profession. Usually exorcists are less public about it. He does have a great prayer website called Auxilium Christianorum  that I participated in as a member of the laity. I'm not so sure about him now.

Did you experience any sort of demonic retaliation after praying the Auxilium Christianorum prayers. I did 3 times not far apart but they subsided. Then I started praying Servite rosary along with the other daily prayers as required by the Society of the Most Sorrowful Mother, the Doloran Fathers aFr Ripperger is part of. Now I've had them come at me again.

The worst was one night I was reaching for my copy of Deliverance Prayers For The Laity and I envisioned the most repulsive image of a demon I've ever seen in a painting or otherwise. It didn't frighten me but I immediately made the sign of the cross and it disappeared. Then a second one appeared (in my mind) as soon as I found the page to begin that day's prayers. I got up and made the sign of the cross with some holy water and then prayed to St Michael prayer.  

Other than that time they try to shake me in dreams. Every time it's  woken me and I was calmed immediately by looking at the crucifix. The instances are not scaring me but I never had anything of the sort happen until I started praying these prayers. I'm 65 yo. They are just enough to get my attention.

Anyhow, his book Dominion has allowed me to figure out what type of demonic influence drives my habitual sins. In my case it's demonic oppression.

I prefer to read Catholic books written no later than around 1910 or so but in Fr Ripperger's case his catechesis is so solid I'm resisting " tossing the baby with the bathwater". I can imagine him subbing for a priest at an indy or resistance chapel and if no one in the pews recognized him they would never know he was an indult priest.
 
I do get some comments I've read about him being a bit too public. Understandable. I just like his style of catechesis.

Father Ripperger has been helpful to me in understanding spiritual warfare. I don't listen to any info about exorcisms -- just not that interesting to me. For those who complain that he says the NO Mass, I am not attending his Mass -- I am listening to him speak on how to grow spiritually.

He would 't help us when we thought a family member need an exorcism.  He sent us through the local NO channels.