I am loving my iPhone X and iOS11 has up to now been great, especially on the iPad.
But on Saturday we hit the 2nd of December and every time my iPhone 6 Plus or iPhone X received a notification the spring board would crash. I ended up turning off notifications on my iPhone X in order to be able to use it.
A lot of users have been complaining about software issues with Apple products recently and I must have been lucky as I have been problem free up to now.