I just got back tonight from Chicago. I had an MVP and a vv3 as carry on. The MVP was in my carry on and the vv3 was in my pocket. I removed the tank from both left the MVP in the bag and put the vv3 and it's tank in the bin with my iPad. No problems at all. I figured I was going to at least be questioned. As far as liquid goes if you think you need a bottle with you put it in the ziplock and leave it in your carry on. TSA will ask if you have any liquids I told them I had a small bottle of ejuice for my ecig in the bag in the ziplock. They didn't even look. Now in my checked bag there was about 200ml of different juices, 3 more tanks, mech mod, and batteries. Only carry what you'll need between flights and till you get to your destination. Don't make a big deal about it and they won't either. But in case you get one of those mad at the world TSA agents, take a stamped self addressed envelope if they want to confiscate. You'll still have a backup in your carry on and plenty in your checked bags. I went through Houston, Chicago, Dallas, and our local airport without any problems.
Now finding a place to vape in the airport is another story.