Because most people don't post here just to say that they have no problems. I have 2 Note 3s (mine and my wife's). My first one went in a few days and was replaced with a new one. That one went in a few weeks (because the battery died during an update that was forced on it while I was asleep) and it couldn't be reflashed, so they replaced it with a refurb. That's the one I've been using for over a year. (I just got finished trying a few different ROMs on it today - it's back to where it was, no problems. My wife's had the battery get hot once. Pulled it, let it cool off, and it never happened again.
The radios are pretty good, but if there's no signal, there's no signal. The Razr was never known for great radios (in fact, the first one was known for terrible radios), so if it works, a Note 3 should. (And with most carriers, you have about 2 weeks within which you can change phones.)
A $10 receiver inside the back cover and a $15 charging plate. I'm using a Lugu Lake for both, but there's a large selection on Amazon. Qi is just about a commodity, so a few dollars more isn't going to buy anything but looks. (I prefer a charging plate with an indicator light, so I know when the phone is positioned right. On this one it has to be a bit off to the right and a little over the front edge.) Once you get the receiver in position, tape it to the phone (not the battery), so if you want to take the battery out you just swing the receiver out of the way on its tape "hinge", and it stays in position when you fold it back to put the phone back together.