Good service but the sprayer and bags are bad
The main benefit is the simplicity of having a soil test done and being told what nutrients it needs and when, without having to find a local soil test lab or arrange things with a local contractor. Great for busy and lazy people.
The spray system needs work, though. The sprayer is junk and clogs a lot, and the nutrient bags are hard to empty completely and hang awkwardly from the hose. Eventually I just bought an "Ortho Dial N Spray" for $10 and dump the bags into that. It works well. I suggest that Sunday just send one of those to every new user.
Without the dumb bag sprayer system, Sunday could also find a better way to package the nutrients, not in single-use plastic bags but in something that can be recycled or composted or returned to Sunday at the end of the season.