Passthroughs, when left plugged in unattended, can be dangerous. I've seen a few get melted down (look around on ECF, they're there). I'm not a fan. Instead get a battery that lasts long enough so that you don't have to be tethered. I'm also not a fan that they can short out your USB ports or even your motherboard if anything goes wrong (not worth the cost - especially in a laptop). I'd rather see people vape out of an outlet USB adapter than their computer if they are going to do that. That said, lithium ion batteries HATE being at 100% charge all the time. It shortens their life. They love 70%. So to me everything about a passthrough is fail. To me the KGO VV is too little too late. Everyone has an EGO Twist and there's a reason for that. They work, and they work well. The Ego Twist is better and cheaper. You can get a 900 mah battery from VaporBeast for a mere $19 AND free shipping. If you want to get a joyetech 1000mah it's going to cost more (and there will be shipping). The ones from vaporbeast have proven quite reliable though.
I have never been a fan of hoosierecigsupply. I didn't appreciate their poor level of customer service so I can't support them (look in vendor reviews if you don't believe me - they've had a few run ins in the past). Plus it really gets on my nerves that Brent acts like he created the KGO lol. They like to put their brand name on their batteries too which is also lame, although I can't speak for the KGO VV.
Also, not to sound like a hater, but PBusardo doesn't know half as much as he thinks he does (like how to clean a cartomizer i.e.
vaping 101) and then you never know how much of his opinions on things are paid for since he gets his stuff free. He got on my nerves when he started pushing a non variable voltage woody mod and although he pointed out a couple flaws he still gave it a thumbs up. So you get a non-durable (dents and scratches easily), decent looking mod (for a little while), that isn't compatible with a lot of tanks, for way too much money and a crappy vape all for the price of an APV... no thanks. For the record this product is no longer in production so that shows how accurate his reviews are.
Instead check out GrimmGreen. He's got twice the following and he owns almost every PV except for the Provari it seems like (he prefers variable wattage and loves his Darwin and Kicked Silver Bullet). He's been
vaping for over 3 years and he's not afraid to thrash a product even if it was free.
Another good source of unbiased information is Estarra, aka RockinRobbieSF here on ECF:
Vaping Estarra - YouTube
Lastly here is the link to the EGO Twist from Vaporbeast. All orders (any size) are free shipping should you choose to follow the pack.
http://www.vaporbeast.com/product_p/a28.htm
I also recommend you grab a couple of E1-Vs from (DiscountVapers.com) or Vivi Nova Minis if you want (they're not as good as the E1-V though, by a longshot, but they come in 2nd place) and you're set to go.