If the Evic is too big for you, just order an 18350 or 18500 tube for it. The 18350 tube makes it no longer than a 900 to 1000mah eGo battery which makes it very pocketable. I'm a guy, but I'm short, and I have small hands. I hate 18650 sized tube mods. I can do 18650 sized box mods, because they just don't feel long in my hands, but 18650 tube mods are just too long for me.
The Evic is not a TRUE passthrough. You can't take the battery out and vape from the head plugged into a wall USB port or your computer's USB port. It doesn't work like that. But you CAN vape from your evic while the battery is charging. This means that if you completely drain your battery to the point where it won't vape anymore, you can plug it in, wait 3-5 minutes, and you can take vapes from your Evic while it is charging the battery. This is convenient, especially in the car. But no, it is not a true passthrough head.
The Evic does best with low resistance coils. It only goes up to 5 volts, so a 1.5 to 2ohm coil is best. I love mine with a 1.4 ohm coil on any rebuildable atomizer. I have an 18500 tube for mine, which makes it much shorter than the 18650 tube. The Evic is manufactured by one of the most well-known e-cig companies in the industry. This basically means that you'll be able to buy replacement parts easily. If you drop your evic and the bottom cap cracks, you can order a new Evic bottom cap that night and have it in your mailbox

It also means that the modders have a solid mod that they can work with, that they know won't go out of style, or production. This means that you can order aftermarket parts for the evic! You can buy a whole stainless steel body to plug your evic control head into, which effectively turns your Evic into a tank! A solid vaping machine, on par with the Provari's build quality. You can also find flat top caps for the evic which look great with rebuildable atomizers, clearomizer tanks, and genesis atomizers.
The Evic also has the ability to check your battery's voltage & to check the ohms of your atomizer which is great for rebuilders. Even if you roll your coil at too low a resistance, the evic will still check & display the resistance of your coil (even if it won't fire that coil) If you get the 18350 and 18500 tubes for your evic, you can check any battery you'd like. This basically means that you can check all of your batteries as you take them fresh off the charger for voltage drop. If they test any lower than 4.2 volts, you'll know that they are beginning their descent into being unusable. This is very valuable info to know so that you can plan to buy new bats when 1 tests bad.
The Evic also gives you the ability to program every second of your vape. You can make the 1st second vape at 5 volts, the 2nd second vape at 4 volts, the 3rd and 4th second vape at 4 volts, and so on and so on...

This is beneficial to people using clearomizers with a particular head that is either not wicking well, or flooding.
The Evic also greets you with your name, can store your contact information, so if you do put down your Evic while trying to get that package of discounted toilette paper off the top shelf, & an employee of the shop picks it up after it has turned off... With any luck, they will naturally start pressing the fire button repeatedly, which will turn it on and display your name. Which will give you a better chance of getting your Evic back after having lost it.
Beat that!