You don't NEED 1" sensor, but you probably want it ;-)
About the original MP fly more - i bought it, the price difference was little more than just the 2 batteries...
Batteries - use it all the time.
Props - well, its good to have a spare.
Bag - some don't like it, i actually use it, starts to show signs of wear after about a year
Car charger - useless for me, for most it works fine as long as the car is running, for me the moment i turn on the lights and an AC, even when the car is running, the voltage drops just enough to make it work intermittently, and it isn't the car battery fault, just the way the car is wired. I am using a third party charger, that works fine.
Battery-to-5V-USB - surprisingly useful, for example, while traveling by plane. You already have the MP batteries, why not use them to charge your phone.
PS: overall it could be better, but worth the deal