I'm going to go back and read up on this thread, but I thought I'd add in my reasons for buying a Provari after a year of saying it was too expensive and 5 clicks to get into the menu was ridiculous.
First, the price steered me away until I realized that it corresponded to the amount I spent monthly for my carton a week habit while smoking.
Second, once I got it, I realized that the menu is a breeze after the first day and I only had to get into it if I needed to change the voltage or check my battery level or check that my atomizer resistance was as advertised. Now it seems natural. I had to click 5 times to turn my eGo on or off. Past that, it was just selecting the function I needed.
Third, it's remarkably accurate in maintaining voltage no matter what coil resistance I use. If I set it at 4.0v with a 3 ohm carto and install my inline digital voltmeter, it reads 3.99v. If I set it at 4.0 volts with a 1.5 ohm dual coil, it reads the same.
If my carto is shorted, I get an E1 code. It produces a list of fault codes that indicate various conditions. I've only seen those a couple of times and there really was a coil resistance problem on a carto out of the box.
It's all stainless steel including the threads for the battery cap. That means it will last and the threads won't wear out over time. It's heavy at 9 ounces, but soon becomes a normal, solid feel. I also like the one year warranty. I send if back, they fix it and pay for the return shipping. For $24.95, you can extend that to two years. I don't generally buy extended warranties, but I did in this case. I can't buy the parts to repair it myself.
As with any good vv device, every vape is the same as the last. I'd buy another one, although there's some competition hitting the market that will probably reshape the playing field. A year from now the ecig world will be full of vv devices that look like the Provari and life for vapers will be much more interesting. I have several ecigs and use them at various times, but I always go right back to the Provari.