I have a PRST and their ballhead too. Very well made, solid to shoot from, simple to deploy. Very happy with it.
[IMG2=JSON]{"data-align":"none","data-size":"full","src":"http:\/\/i66.tinypic.com\/2jdkjg2.jpg"}[/IMG2]
[IMG2=JSON]{"data-align":"none","data-size":"full","src":"http:\/\/i64.tinypic.com\/30cnngh.jpg"}[/IMG2]
I gave the leg clamps a small tighten, oiled the legs to aid deployment, oiled the ballhead and removed a small black plastic disk before I attached the hogsaddle, apart from that it was good to go.