yeah really happy with FE and I can see it will keep me going for a while (at least my wallet hopes so!!!)
Just unlocked the base building on my lunch break and did a 'challenge' mission. I love how there are other things on the battlefield to interact with as well, makes for a lot of strategic decisions I wasn't expecting. The relationship system seems pretty neat as well.
Really glad I got this, though when in chapter 5 there's an obvious split between Birthright / Conquest (if you own both you can choose your path) I actually wish I'd gone for Conquest.
There is a way to purchase Conquest and the other DLC Revelations within the app as well, at a discounted price of $35 each so that is a real bonus. Not sure I'll play all 3, but at least Revelations might be worth a try after Birthright.