The Moto X factory is a drive away (35 minutes away to be exact). I have only used the phone for a day. It was late last night and didn't want to have to type up another large paragraph on my experience using the phone.
Let's see:
Touchless controls were fun to use even if the microphone wasn't as responsive. When it works it works flawlessly, when it decides to hiccups I am stuck repeating Ok Google now a few times. It's a nifty feature however I find my self in awkward situations when texting friends, or trying to look things up and I am having to repeat my self Ok Google Now or I am having to disclose everything I am texting to strangers around me. Often times I found my self just reaching for the phone, unlocking and going ahead and using the device to perform more personal tasks (texting, emails, etc).
Quick Glances was nice, but it's just a neat feature not really terribly useful since it only displayed your last notification.
Camera is iffy, sometimes it takes good shots but most of the times it fails with contrast, sharpness, and detail. Bad post processing mostly. The Iphone 5 took better pictures despite being lower MP, and being far older. In low light scenarios it faired okay, but honestly the Lumia 920/928 completely tramples the Moto X's camera.
I did however greatly appreciate a non cluttered notification bar, similar to what you see on the Nexus device. Helped a bit when managing notifications.
The GUI is fast, and responsive. Only times I got lag were when updating multiple apps (auto update), uploading files, directly after playing a game, or downloading a large file. This appears to be normal on the smartphones I've used or own: HTC One, Samsung S4, Iphone 5, Moto X. I need to get my hands on an LG G2, perhaps one of my customers will come in with one once it releases.
Overall it seems to work just as well as a HTC one, or Iphone 5 albeit the Iphone 5 is a bit smoother experience due to the restrictive and controlled ecosystem and lower spec requirements to run iOS (no multitasking for one).
The S4 as you may know has touchwiz lag here and there although MF3 has certainly helped a bit, and with S voice disabled from home it's a bit better it still isn't as lag free as the HTC One, or Moto X.
Battery life was quite good..
It lasted 4:30 hours of heavy use before dropping to 25%~. That was 1.5 hours of gaming (Restaurant story in intervals, and playing mostly DH4), 30 minutes of youtube, 20 minutes of downloading/uploading apps, and setting phone up, and the rest of the time in my pocket.
Sound is okay, then again having an HTC One makes most speakers sound just "Ok."
Overall I can say the phone works really well, and for the price it's worth it. However the price justification doesn't come in the way of the 2 features heavily pushed by Moto X. It comes from the USA Assembled aspect, and the customization (which unfortunately are locked down to At&t until november).