I just got 5 of each of these to try out to see how they work.In the past few months I have tried a huge amount of regular and LR ones from many different companies in search of the best vape.I started out with the 1.5 ohm on my joker A/V mod.I filled both with Geoffs Blend at 80/20 mix and 12mg nicotine.I started the test at 3.7 volts.It had lots of vapor,great flavor and a good throat hit for 12mg.Next i went to 5 volts but wasn't sure if it would work or not because i saw a few posts saying people with a provari were getting error when the went above 4.5 volts with these.Well it worked,Wow....nice warm vapor,with even more flavor and more throat hit.Now up to 6.5 volts to see if these can take it.OMG huge vapor,taste and throat hit.This is the first time i actually got a cougher hit vaping.Then i went throught the same process with the 1.25 ohm one and i gotta say i didn't think .25 of an ohm would make much difference but it did.The warmth of the vapor from the 1.25 ohm one at 3.7 volts was about equal to the 1.5 ohm at 5 volts,and the vapor,flavor and throat hit was insane.These are hands down gonna be my new carto and i would recommend all of you guys give these a try.Later guys