Hey
Well, i have both - the dura-c and the janty stick, and the difference from what i can tell now that i have both is .. well strange.
The dura-c to me, behaves like a cigarette- it has a throat hit, and a distinct .. hmm taste if you will that reminds me of a cigarette - absolutely in a positive way. When i smoke the marlboro flavor or ry-4 - it tastes like a cigarette, - it might have the underlying "sweet" taste that alot of these things have due to the nature of glycerine, but with the dura-c - to me, atleast, it gets a bit dirtier - in the "right" way - if that makes sense.
On the janty stick however its like all the flavors of the liquids are enhanced. The overall "feel" to me, of the drags i take are softer, but at the same time its way more massive - and since the device is so powerful youre the one stopping the drag and by doing that you can control how big a hit you want.
And the more i smoke, i find myself enjoying, tasting different liquids more than "just fullfilling smoke habits" if you know - and for that matter alone, the JS is best, hands down.
To be honest, i enjoy my janty stick more - it just gives me a greater pleasure in smoking i guess - but the dura-c is still my go-to for the cigarette feel.
Regarding the plastic thing of the janty - i wouldnt be worried. Its pretty small and construction wise theres nothing wrong with it. It wont squish or fall apart - mine had a faulty circuit board, and i guess that happens - i mean it has happened to me with numerous other items (non esmoking related), AND janty has been excellent in their customer service to me, getting me a replacement as fast as humanly possible, - along with extra bottles of liquid for the inconvenience. So i can definately recommend both Janty, and their products - in this case the dura-c, and the janty stick.
Furthermore, if you already have a penstyle, - i would choose the JS - its small enough to fit in your pocket, - it carries enough power to last you all of a day, if not most of it - and should you run dry, its easy to order an extra battery at 3 euros - which is _very_ cheap. The taste on it is extremely good, and in my eyes its a perfect e cigarette, as it does NOT look like a cigarette, and will make people more curious than "angry" at you if you smoke it in a place you shouldnt.
Dont know if that makes sense, but either way in my eyes you cant go wrong with any of those two devices, they will both be far superior to what you have.