All the models mentioned support 510 threading. But in reality, with all the adapters available for only about $4, you can now use any atty/carto (801, 808, 901, etc) with any model you get.
..........If you stealth vape in restaurants, an eGo style ecig is nice. It can drop into a shirt, coat, or pants pocket between vapes. If you get a battery with a 5-click on/off feature, you don't have to worry about it firing from pressure in your pocket........
........My HV and VV vaping is accomplished by a Madvapes $35 variable voltage box mod. It isn't glamorous but it does the job. The parts in an expensive mod, other than the case and batteries, amount to almost nothing compared to the retail price of the finished product. You are paying for design, milling and assembly, testing, and a warranty, as well as the advertising money spent to make it known to the masses.......
There is nothing wrong with a VV box mod. It's a cheap way to try VV vaping. But to state that the technology in say the Darwin, "amounts to nothing" and is all astetics, is WAY off base.
Your $35 box mod is not power regulated or adjusts wattage. I also doubt that it has "regulated boost circuit" technology that maintains ultimate consistency as you vape, keeping the power output to the atty constant as the battery drains. I also doubt you can get 21 hours on a charge (that's for a heavy vaper - many have reported 35 hours) with your box mod. I'm also sure that your box mod cannot automatically adjust the power to the atty as the resistence changes in the atty as you vape, like the Darwin, in order to maintain consistency. I'm also pretty sure your box mod does not double as a pass-through and allow you to vape and charge at the same time.
I think minimizing the the technology features of better models such as the Darwin and Provari does not help a new person understand the differences between models. If you had actually vaped on all of these models for several months, you would be in a better position to provide an accurate comparison.
I am now thinking of trying both the Provari, for when I am at home, and the Volt for when I go out. Problem solved.
I have never been on a forum with such nice people! Thank you so very much.