I just got my one x this morning and I'm loving it. My screen had a yellowish tint to it but it either went away with use or I got used to it. Either way its a non issue for me. I also have no connection issues on att in the USA and have no build quality issues.
Great phone and happy to be along for the ride with our dev community
Sent from my Xoom using xda premium
Nexus 4 - CM 10.1
Nexus 7 - Stock
HTC One XL (backup) - Venom XL