I am still pretty new with vaping and the devices, lavatube is the most expensive device i have bought and i cant really say its bad or good for that price, i think it was close to 70 and as a student its a lot of money. People keep raising provari up and worship it and since i like lots of info, those menus etc are nice things but the cost oh dear.. there's no way i can buy it. So i turned in to modding side, i dont hink that i saw mentioning that you can build your own quite a lot cheaper than commercial devices. It might not be as fancy or good looking or have all the latest bells and whistles but it certainly is fun and you learn oh so much new things every time you start to make something and have to find info how to do something.
One i just made today costs roughly 20$ for parts, maybe less since i dont have prices per item, most are bulk. It vapes everything you can hook on it without twitching. I just did ptr (step-down) mod last week with 2 18650 batteries, tested it from thursday midday to sunday afternoon and i had vaped about 15ml with same 2 trustifire 18650 2400mAh batteries.
These are not much to look at and kinda big and i can't look at the nice numbers(ptr one has only battery volts/vaping volts display)but since i started making these for myself and done few with success and know how they work, i tell ya i don't need to pay 200$ to get same vapor with nice trinkets. This is still new to me and so new devices that i can't say how long they last, might be week or two or year but since i made it i can repair it. Provari seems to be best option if you want decent guarantee.
So thats just my point of view. There are many valid points made in this thread and if you got the money to spend, try different devices, but if you don't have or just don't want to spend money for "nothing", try to define what would it be that you want from vaping/devices. If you just want to stop smoking, eGo type will do just fine and you don't need to spend lots of money, for enjoyment i would say e-liquids are more important than the "best" device out there + they keeps getting better everyday.