I work in Golden Valley, and have had consistent 4g all day yesterday and (so far) today. I believe this is the tower I'm connected to: http://goo.gl/maps/GsB4Q
According to Sensorly's speed test, I'm getting 2.4Mbps down, 1.11 up, and DNS ping of 135ms.
EDIT: Speedtest.net gives a ping of 116, 3.7Mbps down, 1.5Mbps up.