I recently got a mini from smartsmoker (wouldn't recommend). It's pricey, having trouble returning.... but I liked it okay, just want something different (manual instead, had to drag too long on it). My hubby tried it and decided he's ready to switch over to an e-cig also. He is a chain smoking truck driver and I want to get him a manual with a long battery life. I also want to get the liquid instead of pre-filled. So any suggestions what to get and where to get it? I'm thinking the 510? Remember, he drives all day and can't necessarily pull over too often to top off. He also goes to Canada 2-3 times a week. Has anyone had any problems crossing the border with one? He did take my mini up but it looks like a real cigarette. I know I could probably find the answer myself on the many postings here and I did try, got a headache, my eyes are having trouble focussing, brain overload, too much info to sort through! The more I research the more confused I get! Also considering the Chuck but am even more confused about that!! Thanks for any and all input.