A Twist or other variable volt, ego kit should be much better then Greensmoke batteries. I def needed variable volts when I quit smoking. The ability to turn up the power during stronger cravings was tremendously helpful to me. You can, however, find some better pricing around for something similar. Also, I recommend getting two kits as the kit you posted only comes with one battery. Back up is essential. You will need to vape one if the other is charging. Here are a couple of options:
Battery, Tank and Charger Custom Starter Kit! | Origin Vape - This is a great deal, and you get to choose from several options. Get two variable volt, twist batteries and for the toppers I recommend getting the Mini Protank II, as it's glass. Some e-liquids can react with plastic over time. If you google the vendor's name, I think there may also be a coupon code floating around for them.
Innokin iTaste VV (V3) Express kit - 101 Vape - This is only a battery and a charger, but I've had a great experience with this vendor, and they offer competitive pricing. The iTaste VVv3 has pretty much all the features of any other Advance Personal Vaporizer, but packed into a battery the size of an ego. It has variable volts, variable watts, ohm checking (to check your coil's resistance) and acts as a passthrough (vape while it's charging). This was my first upgrade from the ego starter kit I started with, and the vape was much better with this then with my variable volt egos. Variable watts is basically the same thing as variable volts. You can adjust the power to your preferences. However, with variable watts, the device itself "remembers" how hot you like your vape, and will adjust the power itself when you change your coil and the resistance is different from the last. It's like driving a car. With variable volts, you are driving with stick shift, where you change the gears yourself. With variable watts, it's like driving an automatic. It changes the gears for you. This will be pricier then the other kits, as I still recommend two.