I choose a semi disposable as my primary choice but I use several for different reasons. The main benefit of the semi's is the cart/atomizer combo. But I have a cigarello / bada bing type at my computer with a passthrough. My penstyle / 801 has the longest lasting carts and batteries so its great for anytime, especially in the car or working away from my computer. I also use a 901 because it fits in my ipod case, is more low profile and for the size last fairly long without having to change anything. I use it when im eating out or in a store. I would love to replace them all with a semi desposable when the bugs are all worked out. Right now they seem a little hit and miss. I would probably switch to the semi only now if i I had a battery mod that I knew would work on the disposable atomizers and work well. Something like the screwdriver for disposables. And if anyone ever puts out a product that combines all of the above benefits...they have a customer for life.