I have found that many people will give up on the ecig because the model they choose is inconsistent. After many months of vaping different models I have finally settled on the Tornado 510 from totallywicked and setup as follows…
The tornado is the 510 with better batteries and added flavor. I use a 901 cartridge on the tornado because it has a wider opening and better air flow than the 510 cart. I fill the cart with a product called Poly-fil NuFoam, its a compressed polyester seat cushion fill that walmart sells in the arts and craft section. To refill I use Johnson Creeks 3 ml bottles with the glass eye dropper, just insert and squeeze. The e-juice I use is from nhaler.com HV bottles or from DIY flavorshack or tasty vapor. These suppliers are top notch! and have great quality juice that add VG vegetable glycerin to their mix, the more VG the better. Thats my on the go solution and I usually prefill a few carts a week and I am set. At home I use the same setup but I use a 5 volt mod called the PRODIGY V2 by puresmoker.com. Its alot bigger than the tornado and heavier but the draws you get from a 5 volt unit are much more flavorful. But its a juice hog! and needs constant refilling.
I agree that the Tornado is a great mod, but I find it to be a little lacking in flavor when compared to my AtmosUSA “Copper” 6 volt. I sent my “Prodigy V2″ back to PS, as it began breaking down after only 3 weeks of use. I’m now waiting on my large model “Precise” from Super-T Manufacturing. I’m a little hesitant to use it, as it’s another 3.7 volt mod… I will need to see if I can use some 5 volt batteries in it?