I've been using my 4G Verizon MiFi 5410L mobile hotspot for about 8 weeks now, and because I was such a fan in the early days telling everyone to buy it, I think I need to give an update that tells the whole story, at least where I live and how I use it.
To sum it up – when it works it's really good, and when it doesn't it's really bad. It sometimes reaches and even exceeds their stated speeds. But too often in their prime coverage area I get very poor or no service.
What does Verizon say the speeds are? 5-12 MBPS
What do I get? Here's this morning's commute on the New Jersey Transit train from Trenton NJ to NY NY as tested by http://www.speakeasy.net/speedtest/ to their New York Servers (first number is download speed, second is upload):
End of rant.