I have a friend who would like to start vaping. He's a little limited on funds right now, but I told him I would look around for him. He's a pretty heavy menthol smoker. I've talked to him about different models, explained the atomizer and cartridge vs. cartomizer, and he doesn't really have a preference to start off with. I started with a KR808, the cartomizers were a big draw in for me, so I'm thinking either that or a 510? Thanks.