The thing I dislike about the teeter (besides the concussion, which I agree with) is that the 12' plank + 24" fulcrum make it look very similar to a dogwalk (esp. a slatless dogwalk) from the dog's perspective. I have witnessed several dogs (mostly smaller ones) stop in the upper part of the dogwalk ramp, waiting to see if it moves. I have also had a dog make the more unfortunate mistake of thinking the teeter was a dogwalk and running full speed right off the end of it. Luckily he was not badly injured, but his confidence was so shaken that he would not go near either obstacle for months. It took 2 years of remedial training to get it back, and still each straight-on approach he would run past the ramp far enough to be sure which obstacle it was, then circle back and take it. The teeter is an interesting obstacle from the motion control perspective, but I fail to understand why the venues that still have it insist on keeping the high fulcrum for the teeter, when so many other obstacles have been modified for safety (A-frame height, jump heights, weave pole spacing, tire, chute length, etc). It would be a much safer obstacle, and still provide the motion-control challenge, with the fulcrum set at 12" (or lower) instead of 24".