Coming from me, being a daily subohm vaper, Before I jump into the subohm safety thing, if you order this, definately get the extra batt and nitecore charge upgrade. Subohm vaping will drain your battery before you get all the way around the monopoly board. I am glad to see that they are including the Sony 30a batteries as they are a must with subohm vaping, MNKE batteries are another fantastic option and a nitecore charge is a must. Quality chargers extend the life of your batteries and minimize the risk of them exploding while on the charger. The cheap wall chargers that most starter kits are death traps IMO.
Sub-ohm vaping, some love it, some hate it, some are scared out of their mind of it. Personally I love it because the feel, the flavor, the tremendous amounts of vapor, all of it. I subohm almost 100% of the time, while driving, shopping, at the bar, etc. (careful while driving and if you don't crack your window it will fog out the interior). The nature of the beast is that you MUST KNOW your equipment, think suhohm vapers creed, "this is my vape, there are many like it, but this one is mine...". You must use the right batteries, the right mods, the right coil wraps. You need to understand ohms law, invest in an atty ohm meter that doubles as a great building stand too. You must be willing to except that you will need to change your batteries every couple of hours. A 1300mAh ego will last you all day but a 1500mAh 18650 on a subohm will be 1-3 hours.
The hard truth is that if you are afraid to wrap coils, this is not for you. I was a little intimidated at first when I start rebuilding, but with practice, it can be mastered. Just because you are starting out with a .35 build from the shop, does not mean you have to always build your own in the future at .35. You also must be prepared to spend another $75 on tools, meter, wire, wick etc, and don't forget the massive increase in juice consumption (it got to the point that I now make my own juice) Ebay is a great source to buy bulk wire and bulk wick. Most B&M vape shops sell wire $1/ft where you can get 50ft of 28ga on ebay for about $9 shipped.
If you are still interested I can reply with more, just wanted to give you a taste of what you are in for. The one major negative thing that I have found is that once you go sub-ohm, you can't go back. Nothing will taste or feel the same again.