I have, most days. they were pretty horrible the past couple weeks. In the last few days though, there have been great 3g speeds/pings.
Also, I'm not sure if its related but one of our clients was reporting internet connection issues here in stockton. They have (now had) clearwire service, and when we called them for more info they reported to us that the signal was so weak (1-2 bars) and slow because they turned off towers in our area. They were connecting via WiMax.
So, it sounds like the wimax towers are being shut down here! This is the first I've heard of that happening, but I've been slacking on keeping up with recent developments.