I have tried and used Blue Apron, Home Chef, and now Factor.
With Blue Apron the food was always fresh and the flavors were excellent, but there was a lot of prep work, so it took a long time to prep the meals. We used to joke that if there corn in the recipe, the first instruction would be how to plant the seeds.
With Home Chef the prep work was less complicated, and some of the meals were pretty good, but over time we ended up getting a lot of boxes with spoiled veggies, for example, or food that was on the cusp of being spoiled. I got tired of taking pics of the bad food and waiting emails to complain.
Factor is pretty good. The food is consistently flavorful and well prepared. I never have to add salt or pepper. The chicken breasts are perfectly cooked every time, which makes me think they must sous vide them before putting them on the grill or pan for browning. Not all their food is pleasing to everyone, but they have something for everybody. Unfortunately, they are raising their prices right now.
I have heard a lot of good things about Cook Unity, but have never tried it.