I once heard from a Bershader chassid that Rav Pinchos Koretzer used to say that studying the sefer Ohr haChaim haKadosh is a segulah for the neshamah, similar to studying the Zohar haKadosh.
This is because Rashbi had the neshama of Moshiach of his generation, and also Rav Chaim ben Attar author of the Ohr haChaim haKadosh also had the neshama of Moshiach of his generation. He ordered his descendants, the Shapiro grandchildren of the Slovita Press to publish the Sefer Ohr haChaim HaKadosh and that that would save them from evil and harm. They fulfilled his command until there were so many published editions of the Ohr haChaim, that the seforim greatly outnumbered the demand and there were no buyers left to purchase copies. Therefore, they stopped publishing copies of the sefer, that very year that they ceased publishing the Ohr haChaim the infamous libel occurred and they were falsely accussed. (Migdal Oz pg 268 cited by Likkutei Imrei Pinchos Sha'ar haTorah 15)
