Hadn't heard of it before, and I find it very had to believe it will give you a better outcome than Paul Ruzic's controller - which has the advantages of more tuning options and a digital display.
Unless of course your gsensor is dead, in which case as a replacement at about 1/10th the cost of nissan, it would make great sense.
Ultimately, a g-sensor change, or any attessa controller, will only allow you to tweak the hardware you already have. And the basic controllers are still very effective at that.
BTW I'd also take the comments in the article with a grain of salt. For example, an attessa controller, and attessa for that matter, does absolutely nothing braking in a straight line - and yet this controller apparently made the car "more planted under brakes"/