From what I've seen, there's sour grapes on both sides, for the most part. I'm not so sure the improvements aren't simply a different solution to the same problem. Seems they both have minor issues that would be nice to have improvement.
My biggest issue with the HA is the spring bar retention/grease zerks. They have to be inserted exactly the right depth, and they are a wear item. And they are spendy.
A much better solution would be a standard way of retaining the spring bars in the head, and then simply a standard zerk fitting for lubrication.
How does the propride retain the spring bars in the head - same way?
