Earthlink DSL was the first and only DSL service I had, I had it for many years.
Overall it was very good, I had a Zyxel Prestige 641 which they gave me free (which I still have) this was a modem/router built in, great machine, of course they didn't give it out long after that since instructions got out on how to make it automatically log in to the dsl which makes it always on.
However with this always on adsl it was VERY stable, it was very very very unoften that I had any downtime, I got about 1200/250 speeds usually.
I'm not located on the west coast though, so I can't speak for your service. I'm in Atlanta, GA which is where the main mindspring NOC was (which is what the company was when I got it)
Overall I was impressed by the service, although the customer service itself wasn't very good the actual performance was great.
Any questions let me know, I'd recomment dslreports dot com also, they have great reviews and more than you could read.