I was just going to mention your first point, and agree with it completely, they all use the same materials. However I can't agree with your second point. It's unfair to point out that the Boaphiles racks and cages sag over time and not mention this about the others since they all use the same materials
I've got some boaphile racks that are around 15 years old and they are just as usable today as they were when I bought them. No sagging, and even the heat is still good.