This is one of the best Smok devices I've had my hands on. And I've been vaping for 7+ years. The first reason is that it is very responsive. Second, it is has locking features for firing, power settings, and basically a lock on the fill inlet to prevent anyone opening it accidentally (unlike the Alpha Trinity). Thirdly, the battery is pretty sufficient for a good afternoon of moderately hard vaping. You might need to plug it in one time for the evening, and then over night. But that's considering it's all you're using, and you're a heavy hitter. However, if you only take tokes here and there while you're out on the road, the battery would last all day easily. Fourth, there's custom color schemes you can choose. Fifth, being as it uses RPM coils, chances are you might have some around anyway if you use other devices like a Nord. And lastly, the potential of this mod leaking is slim to none within a controlled temperature environment. Any tank or open coil can possibly leak when it's being blasted on by the sun, however when this device was left in the sun once by accident, nothing happened. Literally all that builds up is a little condensation from vapor not fully pulled out if the coil and chimney. I give it an A, and that's only because the battery isn't, as far as I know, replaceable. Other than that it would be an easy A+. Good direction to move Smok. PS Ecigmafia has a killer deal on the replacement pods right now. They are well built though, so don't really need to be replaced as often as say, the Nord series pods.