Originally Posted by gradinaruvasile
Well it is in some circumstances good for comparisons.
The one and only reason for glxgears is to see whether you have any 3D acceleration. The results should never be used for comparisons of any kind. They depend on a whole lot of stuff aside the GPU/Driver and the tests are not even near to real live situations.
second hit when googling only for "glxgears", not even mentioning something like not benchmark.