Great man!, I've used the iPhone XS-Max for 3 years and now I have the iPhone 11, and I don't want to sound like a fanboy but the integration of the apple ecosystem is really amazing. I have the iPhone, iPad Air 4 and a Macbook Pro from 2012 and my productivity is really great with these devices. One of the features that I used usually is the copy-pasting between devices, oh God if I loose that I will die hahaha.
About Bitrefill I've using their services for a couple of years and it's amazing, that's how I can pay my Apple One services and Netflix and a lot of services that I can't pay with the Cuban currency. Obviusly I can't buy a device with Apple devices with Apple Pay because the US Embargo, but it still very useful for me.
Enjoy your new phone when it arrives, and we want to see the unboxing hahaha