I have no experience with Verizon or anything. I just wanted to say that you should be more specific about your location in order to get more accurate info. California is too big and diverse of a state to just ask about experience in the "California area". The forests will have way different coverage than the mountains, desert, or coastal areas, and the same goes for all types of terrain relative to each other. There is way too much geographic diversity in California to give an assessment for the whole state.
That said, Network Vision is well underway in the Bay area and LA, possibly in other areas as well. You can check Sensorly (sensorly.com or there's a Sensorly app) for current LTE coverage (as reported by users; it's not an official Sprint coverage map, and during the network upgrades, towers are liable to be turned off and on as work progresses). You can also get current progress reports of the upgrades at s4gru.com (also not official, but still very accurate). Even if your area currently has terrible coverage, there is a good chance that that may change soon.