We've been doing some version of this for 4 years now. My goal was to supplement those nights I didn't have ingredients or time. It costs the same or a bit less than takeout but is healthier by far. I'm a good cook, a foodie, and love veggies.
I find the portions really vary. If you want a hunk of meat and a side, they're pretty small. If you get pasta, soup, etc, you get a lot. Unless you're feeding teenage football players, there's usually enough for left overs. Burger type meals usually call for patties so big, I portion them out a bit smaller and just supplement with an extra bun from home.
We loved Plated - so sad it got sold and discontinued!
Marley Spoon has good food, but their shipping to Texas was abysmal in the summer. Spoiled veggies frequently. Made me question the meats. I finally had to quit.
Sun Basket is good. They also have fully prepared meals you just heat that I've ordered on accident before. I do NOT care for them at all. We've gotten a few curries where the cuts of meat in them were just gross. You also have to be careful of the uncharges for fancier meats or "gourmet meals" that take your expensive delivery meal thru the roof.
Hello Fresh is good, great packaging for the heat. Good variety. Also some uncharges possible if I remember. As a cook, I don't like that some of the sauces and such are pre-made, so it's hard to duplicate the recipe, and sometimes things are just bland.
Purple Carrot - my favorite. It's vegan, a bit cheaper than the others, and the meals are really, really good. The portions are huge, and the recipes interesting. Lots of nuts though, which means I can't use it when my nut allergic dd comes home from college.