so i saw a link here that a TFV 4 with RBA is just at a sweet RM 50.00

thinking of upgrading my Kanger Subtank from the starter kit which i have been using for 7 months.

is TFV4 a good choice ? or should i save more for a Uwell Crown. Review on the net and youtube so far have suggest TFV 4 may leak if u do something wrong.

My setting.
have been going up and down on the ohm of my coil, but for the past one month have been vaping 0.5 at 20 W. Kind of my sweet spot now.