I’ve seen a few discussions from people using the Hero 3 as a daily device, and the most common feedback is that its compact size makes it convenient for carrying to work. Leak resistance seems to depend a lot on coil condition, proper filling, and regular maintenance rather than the device alone. As with many modern Vape, E-Cigarettes, etc. experiences vary between users and e-liquid types. If avoiding leaks is your top priority, I’d be interested to hear long-term user experiences as well, especially from people who carry it in a pocket every day.