I think you are off to a great start with the KGO kit from DarkCityVapor (DCV). They were highly recommended by some posters here, and we got two kits from them, coming from the EGO-T systems we started with 5 months ago. I have only found a few vendors selling KGO kits, and some put logos or writing on them - I can confirm that DarkCityVapor does not. Also some of the pictures there show gold bands on the batteries, but thankfully they are now silver. Customer service is fantastic, the owner is frequently available on the site via chat, even late at night. The KGO's provide the little extra power over the EGO batts that I wanted, and I like the blue soft buttons better than the EGO's. The black set has a nice satiny feel, with a better grip than the other colors.
First we did the EGO-T system which was okay, then tried the 510 skinny cartos (such as the Boges and Smoktek XLs), which drove me nuts - held little juice, constant topping off, not knowing where you stood on the fill level, leaked if overfilled and made too much noise. Then switched to the big EMDCC's (Ego Mega Dual Coil Cartomizers), which were big and ugly with a huge mouthpiece, but performed well, held a lot of juice, didn't need so much refilling. But they frequently leaked out the bottom, necessitating taking off the battery much of the time just when topping off, then cleaning out the bottom of the carto, making sure battery wasn't flooded (I am so glad that stuff is now history) and the asthetics were awful.
I love the new Ego Visions / Stardusts / E-Turbos - they have many names - I only use the LR ones. (I can also use the LR's on a box mod set around 4 volts or a little higher.) The main thing is that newer versions came out around Feb-March that have a metal pip inside that makes it much easier to fill them without getting fluid down the center tube. I have no leaks at all from the mouthpiece or battery ends, happened only a couple times when I way overfilled them. I am careful to always lay them flat, and vape mostly horizontally, or with the battery end a inch or so lower than the mouthpiece end.
You can very quickly fill them with a bottle dropper, or a syringe - not having to always remove the battery is so convenient. I love all the colors they come in, always thought the clear types were ugly. My hub vapes pretty heavily and used the same one for 3 weeks straight, no cleaning, no rinsing out, nothing, still worked fine. When I finally cleaned it, it was like new. I'm also a heavy vaper and vaped 4 in different colors simultaneously for almost a month, and did not clean them until today, and they are like new again. The colors make it so simple to keep the flavors straight. They also work great on our older EGO batteries. I love the way they perform, never a burnt taste, no fill taste, always knowing fluid level, blissfully quet, and look fantastic on EGO or KGO batteries.
The best video I have found for learning about and cleaning the newer Ego Visions, that is not too complicated, is this one by LordDavon:
Vision eGo Stardust Review - YouTube
Today I finally cleaned and dry burned about 5 of them after several weeks of use, basically using the instructions in the above video, and used them immediately. I doubt I will clean them more than once a week. Not having to do the overnight drying was great. I just took off the mouthpiece, stood over the sink, ran some hot tap water in them, shook them about 10 times, drained the water in the sink - did that about 4 times, each time doing the flicking motion demonstrated in the above video. The dry burning part was what concerned me having never done it. The tricky thing was to pull up the white rubber piece with the metal pip so it wouldn't get cooked - which I was able to do with just your standard drugstore tweezers pulling on the pip, sometimes had to wiggle it a bit. Then I held the button down for about 5 seconds, 5 second break, 5 seconds button press again, about 5 times. To put the white rubber piece back in place I just broke off the tip of a regular wooden toothpick to make it more blunt, pushing on the rubber piece around the pip to get it back in the right position. I immediately filled it, put on the mouthpiece, and started vaping. At first it tasted crappy as the wicks were still wet, but that went away very quickly, within I'd say 8-10 hits they were just great again.
There is no way I would ever go back to using a regular carto after using these EGO Visions. I think the KGO kit from Dark City Vapor is still a great deal at $43.99, even if you toss out the cartos it comes with (they are awful), and never use the cones (yet another thing you don't need to mess with when using Visions). You still get a nice box, two batteries, the USB wall charger, and a manual - when just two batteries and a charger would cost about the same amount. I think the Ego Visions/Stardusts in the colors will quickly become very popular, and perhaps in the not too distance future someone will be selling a no-logo KGO kit that comes with a couple of Visions instead of cones and 510 cartos, but until then, the DCV deal is great.
) here regarding juices which can crack polycarbonate...here's one: 
