I have a couple Protanks and they are not bad but do have a little bit of a learning curve. Protanks are prone to leaking and tend to gurgle if pressure builds inside (usually from getting hot i.e left in your car or from big temp changes) I have found that storing them upside down while not in use helps a lot. I rebuild my coils and have opened up the airflow on the ones i have and that seems to work good for me. I have never used the nautilus but have heard that it is far superior to the Protanks. When your ready to make the the step to RBA's, I would definately look into the Kayfuns or the Russians. I havent found anything that compares to them, especially anything with pre-made coils. Just my opinion and best of luck. And remember, Youtube and this forum will be your best friend when it comes to learning about Vaping.
