I have using this mod for a few days now. As such I have to say it has started to be my favorite dual battery squonker. The build quality is just amazing for it being a 3D printed mod. The dna250c chip is also very user friendly and fantastic. The fire button is clicky just like I like. But mainly because of the way it fits in my hand. I like that it works the same in the left hand as it done in the right. The rage is the only dual battery squonker that I have that doesn't do this. I have 4 dual battery mods and I love all of them. I have no plans to get rid of any of them, but if I was to rate them. It would go like this.
1. Boxer dna250c
2. Mach On3
3. Ijoy 216
4. Rage
I know that people will not like to see the Rage at 4 but for me. It is the most awkward feeling mod in my hand. It doesn't function the same in the right hand as it does in the left and yes I do vape with either hand. I also know that there are people that don't care for the Ijoy 216. Mainly because of the bottle. For me it's a solid hard hitting squonker and I haven't modified the bottle yet. Because mine works just fine for me. Easy to squeeze and I can squeeze all the juice out. The same could be said about the Mach On3 with having a bottle issue. All I can say it that it has not been the case for me. I barely have to squeeze the bottle to get a full squonk. Seems I'm rambling a little. When I mostly wanted to share how happy I am with the Boxer.