I have always been doubtful of its benefits but after giving it a fair chance, that's still the case :/

It removes a tiny bit of code, that does not seem that helpful to me. I still have to add the id in the java code, and I would have to count to know how many characters I save that way. Not many. And now I need to worry about how the bk magic happens to be sure to do not leak that way.

I am used to databinding, where I initially had the same reaction .. but after some use it allows you to gain a lot of time with two ways binding and binding adapters while staying at a sane level of abstraction IMO (it just writes the boilerplate code for you) .