At home, the 4G was blinking on and off, but mostly 3G - disappointing since my wifi isn't all that speedy - I may be in a coverage border zone.
At work, 4G works at fairly well, and much better than the ludicrous 3G "speeds" I used to get (<100Kb downloads at best). My office is in the basement/ground floor of a 90+ y/o building with what appears to be 2.5' thick brick/concrete foundation walls. In the event of a nuclear war I'd survive along with the cockroaches. I do have a window that's at ground level. Being closer to the window got the best DL speed at speedtest.net. When I first fired it up I only got 3G, but when I plugged in the charger it jumped to 4G, yet only at 2 bars.
My speeds so far:
652k d, 418k u
1,086k d, 2,071k u
6,930k d, 2,033k u (window)
1,724k d, 632k u
2,171k d, 594k u
On the road to work about a 1/4 mile away I got 17Mb down, 3.7Mb up and at one point on my drive at the intersection of a major state highway and the Interstate I got 44Mb down and 12Mb up!!!
Moral of the story - If I were homeless and living under an overpass I'd get blazing fast download speeds all the time.