Not a fan.
As this is "FarmChat" lets be honest...their target audience "young, affluent, city dweller, single/couple with little time on their hands but wants fresh" probably is not a high percentage of the members here.
Kinda like going on a knitting forum and asking opinions on a Harley Roadking.
Are they "worth it" - again, to members here...probably not. Many have their own garden, access to a quality butcher and families. IF I was 27, lived in Seattle, Portland or San Francisco (or other hipster paradise),had a loft with a tiny kitchen and in general lived the complete opposite of my life...sure, it would be worth it. Compared to Whole Foods (or Whole Paycheck as they have been known) - there is value in this service...even without a free meal trial.
They deliver smaller portions to eliminate waste and save you the trip to a store - in places where the store is a 60 minute- adventure to get to and will involve having to carry groceries home in a basket on your scooter or bike.
Easiest way to determine is it for me - look outside, how many Bernie Sanders campaign signs do you see? If more than 5 - you better get signing up