The difference in resilience is one essential you can tell if your artificial grass is of high quality or of lesser quality. Grass of good quality will simply recover after intensive use, for instance when you had a swimming pool on your lawn. Grass of lesser quality, however, usually becomes flat and remains flat; no matter what you try to do about it.
When you have put a heavy load on your lawn for a period of time, the grass fibers will lie flat and you can fix this by simply brushing the grass with a regular broom. The fibers were only flat for a short period of time, but will rise and show themselves in their full glory. Your artificial lawn will look brand-new again.
Please remember, The fibers of grass of lesser quality will lie flat and remain flat even when the heavy load has been removed. On the other hand, if your grass is of high quality, you can simply brush the fibers to get them standing straight again. Please note that there is a limit to this as well. Even grass of the highest quality will be affected by intensive use.