I've had my kGo VV for a couple of weeks now...first one messed up and the replacement one arrived Saturday. I've given it a good workout, and my opinion is that it is better than the Twist (which I also have). Both have their good points...but the kGo VV can be adjusted in .1 increments, so the fine tuning is better. Also the battery life (when not plugged in) is a little better than the eGo devices. This is true pretty much across the board with all comparisons between eGo and kGo. The kGo VV only is 650 mAh of ocurse, which might be a deal breaker for some people. But if you happen to spend a lot of time at a laptop, or near a wall outlet...it's not a problem. Like the X2, it doesn't really act as a "true" passthrough. You need to have SOME charge still left on the battery for the charging cord to work while vaping. If the battery is dead...there won't be enough power to vape while charging. There will be if there is some charge left, however. The charging cord will basically "preserve" the charge that is left while vaping, and when you stop...it will start adding to the charge.
It's a good deal. Nice looking. The charging cord/passthrough cord is about 39 inches long. The button is nearly flush with the tube and covered with a rubberized protective band, so some people have complained it's hard to find. I haven't really had any trouble with it...and appreciate the sleek look. The LED is great! And it's easy to adjust your voltage. Plus the voltage seems to be pretty much spot on. You can also "lock" the voltage where you want it to prevent accidental changes there. The battery charge indicator is a plus....but when you get to only 2 bars, you'd best be on alert! lol! It's a nice unit. Glad I got it!