I got an I-Atty, IGO-L and V5 from fasttech
the I-atty doesn't thread well on my zmax v3 and that's my only mod besides the egos, so I'll ship it back and get something else
the IGO-L didn't make contact with my mod's center pin, after a hard time trying to adjust it it worked great!
on both the IGO-L and the V5 I drilled the airhole to 1/16 and re-wicked with a microcoil and cotton ar 1.4 ohms, holds about a mil of juice each, the taste, throat hit and vapor are really impressive, this are becoming my all day devices as I don't have to drip as often as my phoenix v3 this do last me a while, when driving I take both RDAs and if I need to drip again I just rotate between them. I'm returning my I-atty and going to get a few more rdas and driptips.
o now about the driptips... the stock one with the IGO-L feels great, is like you don't have it in your mouth, the slim section fits really great on the lips but I don't really like the look.
I don't know why but the IGO hits harder than the V5