I have been a long time Katana genesis vapor. Since the beginning of a new business some friends and I are starting up, I wanted to rep our product so I needed something that used a simple 510 connection. So... I picked up an aga rda and an Optimus rda.. The Optimus in my personal opinion works way better. The adjustable airflow and compact design is epic. Its sleek yet it produces. The boost is that I started rapping sub ohm coils so with a fresh wick it pops and puffs of vapor out of the 5 holes looked awesome!!!