The Inde Duo is a bad design and the atomizer functions poorly compared to other standard rda's.
The 30mm barrel does nothing but reduce vapor production and flavor. It doesn't fit well and keeps coming apart. Poor figment and design.
Was not designed to function in single coil mode.
The 22mm barrel is very restrictive and gets hot. Hybrid coils such as alien coils get super hot and ruins the vape experience. Also the 22mm shell fits poorly and the unit leaks.
I do not recommend purchasing this atomizer combination. Even though it looks good, you would be better off buying another product such as a simple velocity style rda.
The two stars are for the nice finish in stainless steel.