We had a half share of East Farms CSA last year and it was great, but we live in Provo and the nearest pickup point was in Draper, which was a real pain. We got lots of good stuff every week, but with gas prices as they are, and the fact that we had to do that yucky drive every Thursday, we didn't do it this year.
It's true that they don't always answer emails and phone calls very quickly, or sometimes at all. They're pretty busy, though. I freaked out the first week because I didn't have the address of the pickup spot and it was our pickup day, and I called several times and left messages before hearing from them. But ultimately, they did call back.