I bought and installed a DSC suspension controller on my stock 2014. The car has roughly 25,000 miles on it and the suspension has been unmolested. It's not a daily driver, but more a weekend car, and it sees a few recreational track days annually, just to remind me how capable this car really is.
What a dramatic difference the ride is. The comfort mode is far more pleasant that the OEM comfort mode program, and in Race mode, the car responds better and feels more planted than the OEM R mode. For roughly the cost of a set of tires, I would venture to say it makes the vehicle ride how Nissan should have set it up, absent value engineering. In comfort mode, the car still handles well and is more planted, but without the stiffness and vibration experience with the OEM comfort mode.
It's really quite hard to verbalize and describe just how good a job, and what a significant difference the re-mapping of the suspension does for the overall driving experience, and it doesn't do it at the expense of "sport-car" feel. In comfort mode, its comfortable, but not wallowing Cadillac comfortable, and in R mode, it's tight and planted. And, if the default maps are not to one's liking, it's totally adjustable.
For anyone who's looking to improve the overall feel of the GT-R, frankly, this modification has made the most profound difference in my day-to-day driving enjoyment, without compromising reliability, and for a reasonable cost considering the R&D required to create the three improved suspension maps. DSC has taken the rough-edge "harsh" out of the GT-R and added dialed-in, planted, responsive, ride-on-rails performance when the car demands it.
It's a really neat accessory and money well spent.