Release 4 is in beta test phase, No unflavored liquid comes inside (some call it Primer) to keep the wick wet by delivering, so the CE2r4 is a pure product, no any taste can be traced anymore, we suggest by first time filling to have a few minutes patient to let it wick better.(TIP!).
The leaking has been traced and given solution, the options for Ohms has been adjusted, 3.3 Batteries like 808D1 (3.3V), 510 or M-series we suggest to use 2.4-2.6 Ohms and bigger batteries like 808D1 (3.7V) our VGO or MEGA bats with higher than 3.7 Volts 3.0 -3.2 Ohms for better performance. Lower Ohms gives more Vapor & Heating / battery last longer - Higher Ohms needs more battery Power and we suggest to order the XL versions for heating issues when use High voltage batteries.
Please Notice: our tests indicates when use the first time the CE2 with XL High nicotine the first puffs are different.