Absolutely nothing. Neighbour's kid accidentally broke the driver side glass with a golf ball. Otherwise, nothing.
Great car. Great value for the money. Thousands cheaper than a Camry whilst providing similar room, a more powerful engine, better handling, and more attractive styling.
Though all of the above are personal opinions, I think the value of the car is a rather obvious one. Get the VTEC since there's really no need for a V6. Drove them both and like the VTEC better for its sound and power delivery. Yeah, the V6 is more of everything, as well as fuel consumption, so an I4 VTEC wins some points there.
The V6 is also a VTEC. But I agree that both engines are very good. The 4 cyclinder almost seems more peppy to me from a dead stop, but the V6 will obviously win if you stomp on it. The 6 is a little quieter, and gives no vibration when you're in drive at idle. I can't hear either engine running at idle from inside the car. The only way to tell the car is on is to look at the Tachometer.
The V6 enables horsepower bragging rights for the male ego, too, but if that's not important to you, I would highly recommend either engine.