We've never had an animal get out of the cement wire corrals, but it does have enough give in it to prevent injuries. It's not so much that my cattle are 'mean' or 'wild', they just don't appreciate being worked... can't blame them as they get vaccinated, tagged, branded, preg tested, and weaned through the system. Definately not a positive experience from their point of view, however limited that may be.
Last year had one old gal that was pretty determined not to go into the sorting corral to be pregtested, she lined up and hit that fence for all she was worth, and at 1500lbs, she had weight to go with the momentum. It was great. She hit it full speed, bounced right off, and even though she bloodied her nose, it was enough to persuade her to give up and get on with the program. On the other hand, I've seen firsthand two cows break their necks by hitting a pipe fence full steam. They weren't wild, just worked up from being sorted.
Anyway, to each their own, but I guess I've been fortunate enough with the system here, and just thought I'd suggest it as a cost efficient alternative. It's stood up very well through the years, doesn't need to be oiled or painted, and was very easy to build.