The thing with Rob and Amber is that they are nice to each other. That says a lot in my book. They've had cameras on them so much of the time, you would think they would start bickering. However, I've seen them upset with one another, but not fighting.
I think they are pretty smart because they don't have any talent when it comes to acting, but they are doing the most of capitalizing on their 15 minutes of fame.