So...here's my thing. I can get ilvl90 gear from just running roulette and hitting my cap every week, so why bother with coil other than just for S and G's?
Now, depending upon your build you might want to mix and match certain pieces....but then you're only going after a certain turn repeatedly, not coil in its entirety.
As it stands right now I would much rather get into roulette each day for about 2 hours and then hit CT for my myth (and probably not die a whole bunch). So in essence, the only time i would go into coil is to go after something specific, maybe.
I guess it's for the people who care about clearing the game's currently most difficult content?