It not being available for preorder yet is preventing me from buying the iPhone X.
Okay. Now that I got the smartassery out of the way, I have to say I don't really like having IR dots beamed at my face. It all may be perfectly safe but the iris scanner light hurts the heck out of my eyes so I stopped using it on my Samsung. So I'm not super thrilled about anything remotely similar on the iPhone. However I hope it will be far less obnoxious on the iPhone. It's not really trying to scan my iris, after all. Oh well maybe we will all luck out and find that the dots erase wrinkles. The new Age-Defying iPhone!
I think my biggest reservation at the moment is that I can't preorder an unlocked version.
My next smaller reservation comes from the whole iPhone 8/8 Plus line having some phones plagued with the clicks and crackles. I had hoped that with the familiar form factor there would be no odd rude surprises like that, but apparently such things are inescapable. Iphone X will be a whole new ballgame. I don't mind spending a lot of money on an iPhone but I already sort of beta tested Samsung phones two seasons in a row. I'd kind of like to settle down and have it all just work.
And heck, right now my trusty IPhone 7 Plus is having some hiccups on iOS 11. The battery life plummeted. I ended up with a dead battery by dinner time for the first time in...ever. I'm down to 65% and I barely used the phone today. That's not typical for my IPhone.
I'm glad the preorder date is still weeks away. I'm not ready to make this decision yet.