If you want something simple and easy to use, stick with your ego twist batteries. When you get into the APVs (although you asked for a PV), you're inherently going to have to learn a bit more to use them, or buy an adapter to fit your juice device. There's no getting around a slight learning curve with APVs.
Save up your money for a Provari and don't buy cheap Chinese mods. You get what you pay for. No, the Provari doesn't have VW. It has VV that serves virtually the same end goal, it's easy to use, lots of built in safety features, maintains output voltage until the battery is completely discharged, and it has a good warranty and service from a reliable US company.
Let the flame wars begin.