I bought one a couple of days ago and have been using it alongside ordinary ones. I got menthol ones as I only smoke menthols and even most lights would be too strong for me now.
It is quite minty but despite the vapour hitting the hit isn't very strong (makes it harder for say first cig of the day, arghhhhh I need a cig break moments at work etc...).
I'm wondering if the light ones would be better but loathe to buy them if they are then too strong or taste funny - I struggle with other nicotine replacement things like the little smint things as they taste too strong of cigs as I only have "cheap" menthols.
It's a great idea though and hoping I can switch right over and eventually quit. It took a little getting used to, it's a lot heavier than a cig and no flicking with the ash (sooo nice not to smell of cigs and feel grotty) and looks a bit odd as the end of mine glows green when you use it (you can buy red glowing ones). Quite weird it doesn't go down so there is a natural end but good you don't feel like rushing to finish one or wasting a load of one.