Disclaimer, I have not used the stock coils yet but the RBA section is as good as my Reload 26 but you must use 3.5mm id coils to ensure you have enough cotton to fill the wicking channels or else you will get leaking during refilling. I'm having trouble filling with the larger 120ml bottles such as Dr Fogs, there's just not enough room to get the nozzle through the membrane. The flavour I'm getting from this tank with the RBA is as good as all my high end RTA's Taifun GT4, Van and Del Theatro, Tripod for the price you can't go wrong. High Recommended
