I got annoyed with prebuilt coils pretty quickly. I would leave the house and the dumb coil would croak on me! I had to carry them with me, make a mess changing them in a parking lot, and 30% of the new ones would be bad I switched to RTAs pretty quickly. My coils will last a month and won't die. I recoil once a month only because I'm partial to NETs and other gunky flavors. The coils are still working, but they get nasty looking about then. So provided I don't run out of juice and have charged batteries, no vape going out on me on the way to Walmart, making me panic and wanting a cigarette. Trust me, I almost blew it on quitting smoking a few times over prebuilt coils. I didn't hate the vape on my Aerotanks; I hated them leaving me in a lurch.
Considering how dead-set against building I was when I first started, I actually started building coils pretty quickly too -- started vaping in Feb last year, and was rebuilding my T3S's and Mini PT II's by April; before my birthday (May 22), I had my first Kayfun, and sometime before my appendix catastrophe (June 16), I had gotten pretty expert at building it.
The Achilles is even easier than the Kayfuns, and since I just re-coiled one of my Kayfuns, I realized why: the mounting screws in the Achilles are bigger, and there's a just a little more room to work in, so it's much easier to get the wire around the screw. Throw in that you don't have to worry about all that vacuum business since it's an RDA (that holds 2.5ml!) -- and it NEVER EVER leaks! -- and that thing is a tootle puffer's dream come true. The Prometey is very much like it, except without the deep well -- I never used the filling stuff in it, just used it as a dripper, but the build part is identical to an Achilles.
Considering the Achilles clones (the authentics are no longer available anywhere) are only $18.95, those things are real gems. The clones are the same titanium as the authentics, so extremely light-weight.
Andria