I have star-burst cracks in both of my curved ones and in my center one as well. That is what they are there for...to take the hit. I won't replace mine until they get much worse...because it will happen again. Another thread indicated that rather than replacing with plexi, go with polycarbonite. Costs more, but is more resistant to cracking and will flex to the curved side panel shape without heating in a large oven, like plexi.
"If the women don't find you handsome, they should at least find you handy." - Red Green