I bought a couple of these for trekking in Greenland so that we could have hot food at lunchtime.
The bowels worked really well and have a large enough capacity for almost any meal.
So why, I hear you ask, 4 stars and not the full 5 stars?
There are two minor problems, not significant enough for me to not recommend this item, that we've found. First of all, they conduct heat really well. This means that they can be very hot to hold when filled. Secondly, as they are made of silicon, they do wobble a little bit, so you do have to be careful.
I suppose if you were using on a table, then neither of these points would be an issue, but huddled behind a rock keeping out of the wind, then this is a slightly different matter.
However, as these do the job; fold down to a flat disc; and are easy to clean out afterwards, I do recommend.
(One bit of advice for taking out with you for lunch; do take a plastic bag to put the dirty dishes in; it will keep your rucksack much cleaner inside!)
...maybe only 4 stars is a bit harsh, but you decide!