I have a 510 or 3 and a 901 or 4.
What sold me on the Vapor King is simple. I wanna vape, not maintain equipment.
I loved my 901's vapor production, for the first few drags...then the cart goes emptyish...then comes the mods and the tips and the tricks and all the crap you can do to *try* to get it to be consistant...Straw mods on the original material...straw mods on other materials like batting and fish filter crap. too little pyramid tea bag and it leaks like a sieve...too much and it doesnt flow properly. then you finally get it right and get maybe an hour out of it, less if youre really a hard core vaper.
510...see above progression...
Need I bother to mention the abysmal battery life of the two aforementioned products?
Both are good for flavor testing if you mix as you can drip a bit to check.
Then came the Vapor King.
The first thing you notice is the complete lack of maintenance. You get your prefilled cart, and it lasts like a champ...im talkin 4 hours or so, occasionally less if you breathe through it, but not much less.
Refilling these carts is a snap..a trained monkey can do it once you get the stopper out of the mouth end (and if youre wise, just dont jam it back in with a hammer and you can pop it out with a thumb nail later) and if you plan ahead and have like 4 carts loaded, youre good for all day.
You can buy empty carts so you can fill them with your choice of flavors and swap around...having the cart built into the atomizer means no flavor corruption from your last flavor. Sometimes i feel like vaping coffee, sometimes blackberry, sometimes hilton...as fast as i can unscrew/replace a cartomizer, ive changed flavors...with no flavor aftertaste as is found in a 901/510 atty.
Steve sells all the flavors of juice that his preloaded carts come in so you can refill them with their original flavor and not have to screw with trying to wash a cart...and the relative inexpensiveness of the empties means you can vape anything you want, from anywhere you want, at a whim.
The carts have rubber end caps, and a battery hole stopper. This makes them easy to refill without a leaking mess, *AND* as an added bonus, filled carts are not open to the air, so they store well. You can place them in a pocket or carrying case and never worry about juice gettin everywhere.
Finally, As far as the Vapor King goes, Steve has one of the finest guarantees in the industry. Unlike many fly by night operations, he stands behind his products, a quick look around the Vapor4Life forum here will demo that without my help.
It's a quality product, with consistant vapor production on a scale of hours per cartomizer....cartomizers are refillable, and when they finally flag you can toss them without crying over a lost atty (ever had a truely great 901 atty die? or 510? then you go through 50 finding another "perfect" one? jeez). Every single cartomizer performs exactly the same way. There are no "good ones" or "bad ones"... theyre so simple there's not much to mess up, they just work.
For a man on the go, witout the hours to invest in constant dripping refilling and modding, the VK sells itself in convenience factor alone! Add to that the longevity of a cartomizer's consistant vapor production, and I can't understand why they still make other E-cigs.
I suppose it could be a conspiracy... Every person who throws down a 901 or 510 in disgust having flooded yet another battery, or finally gotten sick of dripping it to get a good vapor hit, eventually migrates to something better.
Am I satisfied with my Vapor King? You bet. Does it show? Probably. My only regret is that I don't own stock in the company, this one is a winner.