The eGo-C Twist grows with the user. If it's too complicated then just give up now. Answer: it's not that complicated. Twisting is easy. Why buy a piece of crap that you'll need to replace, in a month or so, for want of something better?
As I've already mentioned the Kanger T2 burns your lips becase the coil is too close to the drip tip.
If you smoke a pack a day or more (of full flavor cigarettes) start with 24mg. If you smoke less than a pack of day of king sized full flavors (or a whole pack of lights) consider 18mg with a bottle of 12mg as a backup. 30ml is the minimum you'll need to start. It should last you around a week. After you've gained experience (the first day or two) immediately order more or learn how to DIY as I did and order the chems/supplies for that, and do that instead.
Adapter is spelled with an "e", not an "o".
The cheapest, and best, place to get to start getting e-
juice is ECBlend.com where they have a flavor wizard where you can customize your own flavors on top of the fact that it's $8.99/30ml (the lowest price on the market).
Avoid peanut butter cookie and fruit punch flavors which taste "like chemicals".
70/30 PG/VG is, in fact, the best ratio with the widest range of applications. Ratios with higher VG tend not to wick very well in all the commercially available cartomizes/clearomizers (such as the eGo Vision Clearomizer, Vivi Nova Mini, Boge cartomizers).
Wall adapters are better than standard USB only chargers because, if something goes wrong, as you are plugging it in to a desktop (and even more so with a laptop) the damage it could cause from a short, etc... is worth far more than the price of the adapter. I am an IT professional by trade and I can tell you for a FACT that USB voltage output, especially from the frontpanel USB ports, is sketchy at best. Better to get a wall adapter, or to plug it into the (now commercially available) outlets that have USB onboard, or also car lighter USB adapters, than to charge from a computer itself.