To be honest i just got this because it ran on a replaceable 18650 which i like, But when i got it, i also got the RBA section too. Have not tried any coil yet, but the RBA is easy to build on and the flavour just blew me away. Using 2mm ID, ni80 32g*40g fused clapton 5 or 6 wraps, and the taste is awesome. The mod its self looks well made and sits well in my hand, Refilling from the bottom is a lot better than side filling, no where near as messy. For the price this piece of kit is a steal. Would recommend to any one who does not need tight MTL draw, as you can not alter air flow.