Just ordered my Blue Ox SwayPro today. Was torn between it and the Equal-i-zer and it all boiled down to availability in Canada for a reasonable price. I have read lots of good reviews on it, so we'll give it a try. *Looks* like I will get the older style with the adjustable head and sway tension- which is good to me. Guess we'll see when it arrives. The chain link up looks slick, measured my A-Frame and it will fit perfect and Blue Ox products are tank-tough. Heavy, but bomb proof. Used them in the past and was really happy.
*edit* got the newer style- less setup but less adjustability. Need to order the 9 hole shank to get enough drop. All I can say is WOW this thing is built like a tank.