I've heard stories of both extremes, but only around various forums so I don't have any real-world experience of the more negative situations. Never had a problem, myself. Walked past cops on the street while vaping, sitting next to them at stop lights while vaping, driven past speed traps while vaping . . . all on various devices that probably looked more than a little strange to the officers. Never even so much as been questioned about it by a LEO
Granted, I live in a fairly rural area with no local ordinances anywhere on smoking in public places (outdoors, anyway). I could very well have a different experience if I were walking around Boston blowing huge clouds or something. I think with those kind of stories, often the situation has more contributing factors than just the presence of a PV (which has clearly been the case in some of the stories I've heard over the years of confiscation or other issues)