I just got mine today... I'm pretty satisfied with it just as a back up. And it was cheap. Airflow lacks compared to the subtank. One thing that really bothers me is there is about a full second lag between hitting the fire button and when it actually starts to fire. I REALLY don't like that. It's a small gripe but enough to keep me from maining it. And the USB port isnt square with the hole on the mod cover so it's hard to get the plug in. Which I don't want to charge batteries that way anyway so it doesn't matter much, but it's ugly. Solid device though. Wish it was a little bigger, I wish it was the size of the subtank plus/ Kbox combo, I love the aesthetics of it but miss the capacity. Too small for my hands to be comfortable as well, probably better for girls.