Lots of questions, will do my best to keep up:
1. Can you watch video streaming with it?
Yes, but because the box is actually able to run projection by itself so if you wifi hotspot to it or put in a sim card, it will play whatever you want on the screen and it has access to the full app store on android
2. How's it working?
I just got it last night and got it running, was a bit sluggish when first connected but after was surprisingly zippy, will update next week after I've gotten a chance to drive a bit.
3. Is that connecting to the car with a cable or Bluetooth?
I have the box connected with a cable but have the phone wireless to the box