I saw get the v3, I recently upgraded to a v3 after having the v2 for years. Everything is faster, changing tunes takes about 30 seconds on a v3 compared to almost 2 minutes with a v2. So if you change tunes often or ever need to it makes the process bearable. The datalogging seems to activate faster, my v2 was slow when I would press the button. Plus if you ever want to sell it you have to find someone with a 2013, as the newer cars dont work with the v2, so it limits the market to almost zero at this time, and in another year, no one will probably think of getting an very old v2. Hell I bought the v2 after they stopped making it, edgeautosport had 3 laying around they sold on the forum a couple years ago and at that time it was $275 brand new.
And the Stratified traction control is nice, not sure how nice as I had it for a week before taking my car in to the dealer to get my 3rd trans installed...but I have loved the way the v3 feels better built, and it is nice to have the gauges to look at to make sure your car is not acting weird, or you can figure out why it is being weird sometimes right away.