When we got the cage there was a space of about 1 1/2 or 2" in between the fence panel and the mat. When you pushed on the fence the gap grew to upwards of 6". You could put your foot down it (unsafe obviously) Also alot of the Vinyl ripped or tore with little tension. Cheap stuff. The straps that held the pads on the posts ripped when we pulled them tight.
Our first show we had to duct tape the pads on and when we removed the tape the vinyl came off the backing.
Thats why.