OK, maybe the car charger for some is not a necessity, but then again the price difference between the travel kit and the starter (regular) kit is usually so small it is worth it.
The case is not much of a big deal really, but everything else is! The wrist-strap is extremely easy to hook up, yet extremely useful if you're carrying the Vita around all the time, the game cases come in handy and save you space, the cleaning cloth is of the highest quality/efficiency but the real deal in this kit is the screen protector! It is simply, by far THE #1 best screen protector I have ever used. I only wish there were more of them in the kit (there's only 1). The way it applies on the Vita is a child's play, by far the best fit I have seen for any screen protector on any device. And no air bubbles thanks to the high quality cleaning cloth. I recently bought a 3rd party similar kit and when it came down to applying the screen protector I realized what a waste that was.