I am not familiar with the outdoorsman set up you are looking at because I put the Benro S2 on my promaster but before you buy one check out cameralandny. That is where I picked mine up from, Doug is a great guy and if you mention you are on the Rokslide forum he gives you a way better price than what is listed on there site.
EDIT
Just looked at the outdoorsman site and it looks like the pan head or micro pan head DO NOT come with the quick release plate so ti looks like you have to buy the head you want then buy the plate(s)
I have 2 plates for my Benro head, one stays on my bino adapter and the other stays on my spotting scope. I like having the plates stay attached so I don't have to mess with taking the plate off my bino adapter and putting it on my spotter if I want a closer look. Much easier and quicker with both having there own plate. I am going to pick up a third plate for when I take my camera out so I can still switch between optics quickly.