I am now into my 8th day of VZW 4G. On 4/22 I upgraded a 3G MiFi to a 4G MiFi, purchased a Thunderbolt and a Xoom. The first 2 or 3 days was a beautiful thing for the most part. 10,15 even 20Mb down connections and as much as 12Mb up. Bliss! Then came "the outage" and it's been nothing but disappointment ever since. Another oddity is the range now. If I get only 10' or more away from the MiFi it's no longer visible.
This week I returned the Thunderbolt because I couldn't find the 4G benefit and the Xoom without reliable 4G is pointless for the purpose I purchased it.
I have kept the 4G MiFi only because I still need a MiFi whether it's 3G or 4G. However, it would seem that even that is in question now because as of this moment I stall can't connect at better than an old 2400 baud modem in either direction although I have a nice bright green 4G light.
Honestly, this seems like the kind of problems I experience in the dozens of alpha and beta programs I participate in. VZW 4G is NOT ready for prime-time.