First, it offers a variety of share sizes at reasonable prices, particularly for single folks or couples (of which I am one). I don't need a giant box of produce every week, and I appreciate a CSA that offers a smaller size. Second, the CSA is made up of multiple farms, so there's always a great variety of produce, and it's also available year round! (This is amazing. I love a year-round CSA.)
Finally, I love the flexibility that allows you to sign up for the CSA at any point during the season. You can purchase a share for a pro-rated amount at any point, so you don't have to worry if you've discovered the CSA a week or two late.
Know Your Farms has some other great initiatives, such as farm work days and tours and workplace wellness programs, all of which I fully support. I've been very pleased with the quality of my produce this season, and I highly recommend Know Your Farms to anyone else looking for a great, affordable CSA.