I had the same feeling with my penstyle. I wasn't sure what model mine was exactly, so I would call it a 801/4072. Turns out it was a RN-4072 (not that this makes any difference). But when I first got it, it sucked. Hardly any vapor and it was never consistent. I kept with it though, and now it out smokes my 901. It was almost like it needed to be broken in. 2-3 drops of
juice in my pen will last about twice as long in my 901. There still in some consistency issues with it, but over all I am very happy with it. The battery lasts quite a bit longer, and the efficient way it uses
juice is a plus. I use it mostly when I am at home in front of the computer, so it serves it purpose well in that regard. I take my 901 with me on the go.
In your case, it could be a weak battery?! I know when my ecigs
batteries start going it and you slap on a freshly charged battery, wow, what a difference.