I received my Penstyle and liquids from BestEcig a few days ago. I can't really compare because my previous e-cig and carts were from Smoking Everywere and they SUCKED. (SE was very hard on my throat, made me cough a lot [this coming from a Lucky Strike and Cannabis smoker])
I got high (16mg) of reg tobacco, flue-cured and marlboro. My favorite of the 3, by far, is the flue-cured, it simply tastes good! The regular is OK, the marlboro I'm not sure about, I only tried 1 cart, I think it produced less vapor and lasted less then the flue-cured carts. I just love sweet taste of the flue-cured
I haven't tried other brand yet (PureSmoker, TotallyWicked, etc), so I can't tell you how it compares, but standing by itself it seems like an overall good liquid for me.