I own 3 nautilus's I absolutely love the tank. there is a learning curve to using it tho. make sure you tighten the coil to the bottom piece securely. then while screwing the bottom back on, upside down....you want to just get it tight enough to make the seal. do not over tighten that part. or when you pull the bottom off for a refill the coil will still be attached to the stem that is part of the head. make sure you prime this bad boy several times. just a nice long, light draw. 7-10 times. then when screwing the tank to the mod, or battery or whatever you are running..make sure you screw it just tight enough to make a connection. that s where 90% of people's problems come in. they over tighten the tank to the mod. you just want to make a connection, thats it. if you over tighten there...you will push the connection pin up, and the e-juice will be able to flow back into your airflow system. it took me about 5 coils to figure everything out correctly. but once Ilearned the tricks...it has been smooth sailing. also, be careful in hot temperatures. it is hot where Ilive. and the temperate will make almost any tank leak. but not the nauty if handled properly. happy vaping