i did... i just got my first coil built... shooting for 2.5 Ohm, got 2.8 and at 4.5v it's pretty good, but airy... looking to put the right o ring on the connector... but not to your question..
the COV wire is good, it's not a whole lot for $4. ea. but it seems like enough for a bunch of
coils.. maybe 3 or 4 times what came with the iatty i got.
I am grateful they have the stuff.