As a person who owns both an eGo Twist, and a Provari, I can personally tell you that the two do not even remotely compare. For starters, there is a voltage drop over the charge life of the Twist, not the case with the Provari. Plus you have basically a full on multimeter for atomizers built right into the Provari.
I will be putting my Twist on the PIF pretty soon.
*Don't get me wrong. The Twist is a WONDERFUL device for a VV noob, who wants to see how it suits them without dropping alot of money up front. In fact, to the OP, I would suggest getting one for this reason. Try it for a month. If VV is your thing, go ahead and treat yourself to a Provari. There are plenty of people out there who prefer a good mechanical mod over VV, so you really want to see what suits you before dropping a ton of cash.
Also, for the person talking about the menu system, it isn't as odd as it seems. It takes most people, including myself, about 5 minutes before they can run through the entire menu system, including making adjustments, without even looking at the screen.
The ProVari's been out for a while now. The biggest reason to buy one back in the day was the fact that it was variable voltage. Now the eGo Twist is out. I don't understand why people would 4x the money on something they have to sort through a menu to do something that the Twist can with the turn of a dial.
ProVari will go to higher voltages and has a longer battery life, but personally I'd never need a voltage 6 volts and would just buy a backup for when my first twist died.
Only complaint with the Twist is that the dial doesn't lock in place - you have to check it pretty frequently.
But hey, if you want it, get it. That's just me.