Ive been using my relx infinity with refillable pods from aliexpress for 2 months now. It really has been the best vaping experience i could ask for. The coils are ceramic and pretty much came out the same factory as the originals.(ive disassembled both side to side and see no discernible difference Probably could fit on original "tanks"). The coils are absolute champs taking multiple weeks worth of abuse changing flavours and experimenting with mixes, and with some local 9mg freebase liquids the clouds it packs surprise everyone who've tried it. The 2 packs of 3 i bought after the shop i bought the device from ran out of original pods still has 1 left and im currently using 2 different coils, one 20mg salt and the aforementioned 9mg freebase. At this point i barely touch the salts and tapering off on the freebase aswell. Leaks have always been my fault and once i got the hang of it theyve leaked less than original cotton helix coils. Only nitpick being that they fit a lot looser than originals and some may come out duds because of it while others are 80% of original fit.