It's super easy to write a component in ng2. I feel like it's faster, but it's been about a year since I really used ng1.
My favorite thing about ng2 components over ng1 would be the annotations. One annotation turns my component into a component. It links the html template, sets up the services, injects the other components and directives it needs in one simple annotation. In ng1, I remember it being cumbersome to set everything up.
To use a component in your existing app. You create a new ts file. Add an annotation. Write the template inline or in another file. Reference that ts class in your other components. That's it!
I know it's supposed to be faster - I just am not finding people using this stuff in production seriously until now.
I don't want to clog up the angular group with these informal lines of questioning - obviously.