had been waiting since November to try to get an APR tune on my CS, and was just finally able to have my ECU sent in to be extracted, and the tune installed last week. In my opinion, it is a great investment. Much smoother throttle, more power, and the auto stop start is defaulted to off. If you have been waiting on a box revision, I recommend reaching out to your dealer or APR to see if it is available.
I have most of the bolt on stuff (charge pipes, cold air, turbo inlet, downpipe and Neuspeed FMIC installed, and will be swapping out to the colder spark plugs today. Ran the JB4 for several months, and stacking these two together could be great. Drivability is much, much better with the tune, but I may use the JB4 to add an IS38 later as APR has no current plans to support that on the Atlas (at least for now).