We trialled Hello Fresh and came to the conclusion that it was fun and the produce was of a good to high quality but that we wouldn't pay full price for it. We selected vegetarian meals and at full price it worked out at around £6 per head, per meal, which is more than I would normally spend. Also, I don't know if it was just bad luck but each week we had to have a risotto, which we're not fans of, but this just reflects that as a vegetarian you will have less choice I guess. Maybe the price would be more acceptable for the meals that contain meat and I can't comment on the quality of the meat obviously.
We recently tried Gousto too but they couldn't even get the trial box to us and bizarrely they lied about the attempt to deliver - awful customer service in trying to find where our box was, and ultimately a box containing igriedients for 6 meals will just have been dumped somewhere and wasted, which really bugs me. So, HF definitely a better bet than Gousto.
One down side of either of these meal delivery schemes is the sheer amount of packaging they use. I understand they have to insulate the food to keep it fresh, but I remember thinking it seemed really excessive and another reason why I would only use occasionally. Great to have some new recipe ideas though, that's the main advantage, I wouldn't say they save you any time because making something for the first time always takes longer than knocking out your regular meals.