they do put out vapor but obviously people are getting a wicking issue at that volt, its happening time and time again, then they try the 2.5 ohm on a 3.3 volt or lower and it doesnt experience these issues that much, thats why when we use a variable device with the 2.5 ohms they seem to wick proper at 2.8 volts to 3.1 volts.
thats the experience many have had, then we use a higher ohm 2.9 or 3.0 ohm e2 and they wick so much better at 3.7 volts, my 3.1 ohm works great at 4.2 volts.
everyone uses different juices so they will react differently but im pretty sure the ohms is a main issue, when i ump up the volt son my variable i can replicate the bad taste instantly and then i can get it o wrok proper again by lowering the volts.
and while the 2.5 ohm produces vapor so does the 2.7 ohm and 2.8 ohm and the 2.9 ohm and the 3.0 ohm, they all produce huge vapir and you can clearly see that in my videos since i have used them in at many ohms and voltages.
As to where to get them, I dont know who has the proper ohm'd ones other then buying them direct. i still have some samples to send out so you can drop you addy in my pm and if i have enough to spare ill shoot you a couple.