In a comment to this answer @Danny Beckett notes that
The problem is, personal experience and word of mouth sounds a lot like a personal opinion
I can have had a certain (work) experience (e.g., a certain company with certain internal guidelines), but that does not necessarily mean that I also have an opinion on the subject (within the frame of the example, I might don't care about the content of the guidelines, I will follow them without necessarily be happy or unhappy with them) or, viceversa, I might have an opinion not based on any experience.
My question is, where is the boundary between opinion and experience?