Adam I you use a tripod like the 501 that uses the 501 QR plate then get the 577 Quick connect, as the QR assembly and plate is wider on the 357 Pro plate.

I accidentally ordered the 357 thinking that I could use a 501 style QR plate and was wrong.
So if you use a Bogen 501 style tripod and QR release then get the 577 QR assemble and then if you need a longer QR plate get the 501PLONG Quick Release Video Camera Plate.

Since all of my tripods are set with Bogen 501 HDV heads I make sure that all of my gear (where needed) has the 577 QR assembly mounted on it. Makes it easy for me to transfer my camera from anything to tripod.

I've made up a plate to take three cameras - or two if I only want two - to go on a tripod. Easy as wink to make it up. Can shoot all three cameras through my teleprompter if I want to...

Michael, that's great info and exactly what I needed to know. Thanks. I was hoping to get the cheaper 357 and a longer plate in the process. I already have a 577 as well as the 501PLONG, so I guess I'll just be getting another.

Thanks again for the info.