Vibrating massage pillow is it safe?

Anyone here using or used vibrating massage pillow? I am always having back pain and i really wanted to have it relax even for awhile. I tried massaging my back with my hand and i found it calming, so i wonder if i can purchase the portable pillow massager, i have searched it online and some articles say its not good for pregnant, but some articles also say it is safe for pregnant. I am really confuse, i just want to be comfortable and ease the pain. #advicepls