Hello Folks: While agree with the ease of stock coils, I personally find enjoyment in building simple coils for my vaping, and the massive savings that I get from doing so. I find that I can dry-fire and re-wick cotton for a heckuva lot longer than I could use a stock coil, and I'm concerned that at some point, we might find it more difficult to obtain stock coils. A relatively short learning curve does indeed put you in much more control over what your coil is made of, and how you can change things up to suit yourself.
PS - TOTALLY agree with comment above regarding finding the right tank...there are so many choices. It's well-worth doing some good research, talking to people, and even if possible "hitting" a tank before deciding to get one you'd like to keep.
(Long-winded, I Know)...AND IAN. I actually do still use my T20 a bit, but use my T18 every day as a stealthy, non-clouding, incognito, work device...for as long as I am able to keep getting coils - I'll use it.