I'm sure real RTA's are more flavorful then most of my little tanks with prebuilt coils, but I can't risk the leaky ones as I travel. For me I don't have the time or patience to play with wicking over and over, and still not have 99.9% confidence it's not going to leak again. While not flavor monsters, the Cubis, Melo 3, and the new Eleaf Lyche, have never leaked a single drop on me. I'm hoping my new Kayfun v5, does not leak, according to those that have them in hand already. And they have been making these popular RTA's for a long time. It is however a tall tank at 60mm. A Cubis is only 40mm to the top of tank. Someday, when I'm bored and have play time I'll revisit the Goblin Mini 3, and Pico tank, but doubt I'll ever put them in a pocket or bag again.