I have a problem with the DTHS. It's not a big one, but the arm length is pretty short. When the engine is hopping around it's going to move in an arc with a radius defined by the length of the arm. So some of the up and down and forward backward motion is going to have a side to side element to it. If you've ever looked at a Buell you'll see the lengths, (pun intended), they went to to minimize this with a really long arm. Also the only way the frame end of the arm is indexed is by the clamping force on the tube, they skipped the bolt holes. An isolastic headsteady is the only one of the three that actually makes any sense because it's close to the centerline. There's been some talk about having three points to make a plane for the isolastic principal to work. The thing is they have to be in the same plane and that should be the centerline, or as close to it as possible. BTW, the front iso is nearly useless is this regard. The only thing it's good for is to keep the engine from hitting the ground.