While not a perfect bowl, here's why I like it over other options:
-Aluminum is more delicate
-Titanium is more expensive
-Better to eat out of than plastic, which is also less durable
I have a few negatives, though. The shape is a little too deep for me to lick clean though, but if you have an exceptionally long tongue it shouldn't be problem. It also conducts heat very well so I have to be careful with hot meals and drinks.
Having said that, they are very durable. I ran over my first one with my truck and it only bent in the center. I was able to punch it back out and it makes a pretty good dog bowl. Since it's under $5, it wasn't a big deal to buy another, which has lasted beautifully since.