WOW! is 100% accurate.
I went an picked up one of these today. SOOOOO much smoother than the S4. Anyone who thinks this phone is a mid-grade phone, hasn't used one.
I can't make this phone lag. Buttons are rock solid, tight. No plastic "creaking" noise when squeezed. Back speaker is LOUD compared to anything other than the HTC One.
I almost bought the S4 again today, then I thought, I can take it back within 14 days, I will give Moto a shot since I had tried a couple LG phones and S4 already.
Great phone. GREAT software. There are some Killer features on this phone. Maybe not as many as Touch Wiz, but I had 90% of that fluff turned off on my S4 when I had it anyways.
I kept my iPhone and will carry 2 devices. I can't really whip out a Moto X while I am at work. (apple) Now I have the best of both worlds.
Honestly, anyone even remotely considering this device, pull the trigger, try it for a few days. I promise you will be impressed.