I just got my Kangertech Mega a few days ago (after having a miserable time with a Nautilus Aspire). They didn't have any of the newer sealed coils, but the Dual Coil Protank 3 (2 Ohm) works great in my Mega. I've read the newer coil may suffer some of the issues the Nautilus coils suffer, so if I continue to have such great success with the Dual Protank 3, I'll stick with them.