I've had my nautilus x for about a week now. It was purchased from an official aspire dealer. I used it on a new eleaf pico. The first 2 coils that came with the tank were a disaster and burnt out within 2 days and the tank was getting quite hot. Wattage was set at 15 and 1/2 open air hole. The first coil was used with 50/50 juice and the second with 70/30 juice. I was not a happy bunny so took the tank to local vape shop who assured me they have sold lots of these yanks with no issues. I purchased a new box of genuine aspire 1.5 ohm coils and tried again but guess what..... same problem. I gave up on it and threw it in the bin! Rubbish product, £38 quid down the drain.
I may be gullible or stupid, or both, but I've Just ordered a new Triton mini tank and hopefully the Clapton coils will prove more successful.
Wish me luck!