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To your first questions, yes the process is as simple as that. Your recovery phrase is the key to accessing your assets on the blockchain, so control over your assets goes wheerever those words go. Importing to your new X will allow you to manage your accounts with your X just how you do on your S+!
Stax provides the same security, better battery life, and an amazing on-boarding and transaction signing experience (we just got ours to play with at the US office today :D)
So far my favorite features are how much simpler Bluetooth paring is, and the ability to generate an address QR on your device screen. The curved e-ink is pretty sweet too. We’ve been enjoying changing the device name today.