Newbie post: Just did my second (ever) build this morning, and the K5 is hitting much better now. My first build was 24g Kanthal w/ 9 wraps @ 3mm (.9Ω), which worked decent but took forever to ramp up to temp. This new build is still 24g Kanthal, but w/ 5 warps @ 2.5mm (.41Ω), and the ramp up time (at the lower wattage I use) is much better. It still takes about 1.5 seconds to ramp up, but for me that works, and it keeps the temp of the vapor a bit cooler (at the lower wattage).
The other thing I did was to remove the outer layers of the organic cotton pad before wicking the coil (saw it done on YouTube), and the flavor appears to be a bit more pure. The nic delivery on the K5 is much stronger that it is on my Nautilus coils, which I'm sure is probably true of all RTAs (but this is my first), so I'm going to either have to reduce the nic in the mix or hit it much less often. With the air flow wide open, I'm able to get slightly restricted DL hits with great flavor and vapor production.
I've got some 28g & 30g Kanthal and Nichrome coming in the mail this week to try some other builds (like a twisted coil), and so far I'm really liking the rebuild-able lifestyle. Yesterday, my 521 tab and magnifying lamp arrived, so I don't have to strain my eyes doing builds, which is always a plus. I'll probably pick up a KFM v3 at some point in the near future, and maybe a KFL+, since their product quality is so outstanding.
How far down the rabbit hole will I go? (we'll just have to wait and see)