For what it's worth, every joyetech product I've owned still works as it did when new, including my high-mileage eVics. My only eVic complaint is the delay when you press the fire button. (and the silly screen options on the Supreme)
My guess is the eVic VT is going to be a big seller
It's looking promising, two reviewers initial comments are looking good. Hopefully it will drive down the price of the SXmini M so I can buy another