Well I have been using the Ijoy Elf since 10 am this morning. I stuck the 0.5 coil straight in and im experimenting with the wattage at the moment. It recommends 25w -35w but for me even 25w is too high, gets a bit hot and you get a slight hint of burning taste. I usually set it to about 18.5w for the 0.7 Nautilus coils and with the 0.5 coil tastes just as good. Though i have found 19.1w is perfect for me. I am vaping on Powwow E-Liquid by Spiritwalker which is 60%VG which along with some of the EL Diablo range is my favourite at the moment. At the moment taste wise the Nautilus 2 and the Ijoy are quite similar, maybe the elf just nudges is it at the moment. The real test for me will be if there is any leakage. So will hold off for a for weeks before judging it properly, as after a few weeks my old tanks started to leak.