I have them, 3 badly impacted, one was pulled a long time ago. I just recently brought it up with my dentist again and he told me that only 2% chance of it becoming into a cysts and if it does then it will be real bad. So, I'm not fully convinced yet - to extract or not, that is the question.
It does not bother me at all. However, both my kids have 'soft teeth' (baby teeth) as per my dentist and I have had extensive work on one and the other will have to get work done within the year, so I might just suck it up and get it done after all.