Qingu and I did it this past year. We had a spring, summer, and fall box. Unfortunately, I moved 8 hours away mid-summer, so I can only talk about the boxes I was there for.
First of all, I enjoyed it because we supported a local farm. Our CSA did not require on-farm participation (some do) or offer a discount for it (some do). We got a weekly share at a competitive price for the Chicago market. We had some tremendously bad weather which meant that we got less food than I expected, but it was okay. Split between four people our share was about $7 a week and still gave us food that never seemed to get used in the fridge.
I enjoyed the challenge of getting stuff and then having to figure out how the heck to prepare it. I enjoyed going to the market to pick it up. I did not enjoy the earliest part of the year, when our pick up was way out of the way and generally a pain in the ass. I like our farmer. I’ve never pickled or canned before and the CSA got me to do that. It was kind of an awesome experience—I have pickled mixed peppers in the fridge that I’m super excited about.
I suspect, however, that I am being somewhat overly pleased in my reminiscing. I suspect Qingu has a more current and somewhat different opinion of the entire thing.