@Kattykit that's great to hear that it is working well for you with no side effects. Exactly what we want when trying these new medications!
I think the comment about the "con" from @Aggie is that this new drug has been heavily marketed as a breakthrough and is yielding a high cost but it has failed to prove any statistically clinical benefit in overall survival for patients that take it. In other words the survival hasn't changed at all. People are still living the same amount of time whether they do or don't take it.
I'm fairly certain the latest PALOMA3 study again showed no improvement in survival.
The improvement is in progression free survival only. So that doubling of 2 years isn't actually extra time in terms of life, it's time to progression.
Hope that makes sense.