I won't lie, I love my V3...as soon as Cobb offered the upgrade option I jumped on it. I love being able to monitor 6 things live, the screen is super crisp and it flashes maps way faster than the V2. But is it necessary? No way, you will be fine with a V2 and as far as I've heard Cobb plans to support the V2 for a long time...so if you're getting a really good deal on the used V2 I'd jump on it, then you can use the saved money for other goodies for your car. Just my .02.