I was warned about them frequently during my "Bible" study, perhaps in an attempt to get me suggestion of demons so I would attribute anything to the demons. And I presume they wanted to use this to rid my place of things like music, TV, videos, and the like.
Eventually I realized that Jehovah Himself was more than capable of doing these things, and that calling on His name might lead to His stopping for a time, or until He wanted to extort even more out of me. Satan was totally innocent. To prove that point, I went out and bought the most filthy rap I could get and checked the booklet. Every time, under the "Thanks", where God by any name was praised, I whited or blacked it out and put "Satan" in its place. I also got the Satanic music that the Watchtower Society explicitly warned me about, including Led Zeppelin. I put Led Zeppelin songs in my computer. I have all those death metal songs that the Watchtower Society was explicit in warning me against with the demons. So far, there have been no demons.
Further, I destroyed all those Puketower and Asleep! magazines that were supposed to protect me from demons. I also totally quit going to meetings and field circus. Then I went out and bought myself a Ouija board. No demons. There were no demons coming into my computer when I went to all the apostate Web sites that I could find, nor when I joined forums for apostasy. Nor did I get attacked by demons when I ordered lots of Christmas decorations, including crosses. Thus, I concluded that Jehovah Himself has been making problems in my life, not Satan, and that He would use them to extort me into ever more service.
Notably, since I have turned apostate, I haven't noticed any detrimental changes. The only difference is that Jehovah has nothing further to gain by harassing me (aside more apostasy and more of what He claimed to hate) and that I am no longer rewarding Him (and wasting my time) by going out in field circus.