At Cleavland, a rookie team's defensive robot did some serious lexan damage to the field. Can't remember the team number, sorry.
But anyhow, their robot was kind of like a little 5" tall bulldozer with a steel diamond plate blade. Their blade caught the edge of one of the lexan panels making up the fence running the length of the field. They had a four cim total drive system and some awesome tires, so... they got about half way down the field, chunking off every lexan panel as they went
. I was standing about 10' from the field when it happened.
All in all though, the field has been extremely durable this year, except, of course, the automatic scoring system.
-Q