Vaping for three years. Started with V4L 808s. Love the company and its products. Get my juice from Tasty Vapor. Recently (from V4L) picked up a couple of Titan XL batts and love 'em with the single coil tanks. I'm a tank convert now. The Titans last about 5 hours per charge, the way I vape.
Kept reading and watching (YouTube) reviews of the eGo. Then saw some reviews on the kGo and researched those. I decided to go with kGo. Better overall reviews, actually, in terms of production, flavor, and some did not like the eGo's proprietary tank / atty system.
Instead of a kit, I ordered only EXACTLY what I wanted, from Northwest Vapor. Two 1100 mAh KGO/EGO/RIVA batts and cones; USB charger and wall adapter, 510 to 808 adapter (so I can use my existing tanks and carts on the kGo), and a hard carrying case. Plus two E-Turbo LR Clear Atomizer Tanks from mtnvapor, which several commenters REALLY liked.
Everybody raves about the kGo batts. Now, with the adapter, I can use pretty much whatever I like (or have on hand) with the kGo.
I was a 2-pack a day full flavor 100mm analog smoker for nearly 50 years. Thank heaven I'm still healthy, except for some COPD, which isn't serious enough to even require medication. I took to vaping immediately -- from the moment my first shipment arrived from V4L. I could feel the difference the first night, 12 hours later, when I went to bed -- and didn't hear the internal wheezing.
Tried all the flavors I wanted to. Seems I've settled on Cafe Machiatto from Tasty Vapor, which I really love, for the past two years. I like their Doublers (the same flavor you order, but with no nicotine, so you can cut your nic-juice in half, thirds, quarters or whatever, without losing flavor).
Good luck!
(Not only will you feel better and be healthier, you'll save a truckload of lettuce. I've spent maybe $300-$400 on ecig supplies in three years. That's less than forty cents a day -- for the SAME SATISFACTION! Amazing.)