There is a whistle, but I have to say it really isn't enough that it bothers me, and nobody around me has even mentioned it, that's what I was most curious about, but it seems rather insignificant compared to the performance - I ordered another one this morning with some coils, fearing it will go out of stock. I have three or four set ups that a vape throughout the day, I like changing up flavors every hour or two, I enjoy each flavor I found a lot more by doing that, I never get used to a flavor or bored of one as quickly. In saying this, it lasts throughout the day into late evening before I needed to charge, I just put it on the charger so that's twice since around noon Saturday and I have been using it a lot, I have two tanks I switch out for now. Maybe a better description is two small and one xl tank off of one charge. I have noticed I am using a noticeably less amount of juice too.