Summary: Used in conjunction with the 394 adapter I have used these on kit that needs to mount interchangeably on a tripod.E.g. Video crane, 501 video head, slider, ball head, etc.Very solid, quick to interchange - worth the money.
Summary: Obviously you have to have one of these to use the 410 head. It is quite large though and sits on the head well. It can be locked down solid. But is a little awkward to get used to. Once seated though I couldn't fault it.
Summary: This is a very solid qr plate. Once you hear the click you know your camera isn't going to fall off any time soon.Only problem is you need to have some thing to hand to unscrew it from camera when not in use. My cheapo Slikpro head has a folding butterfly head on the screw which is much easier to fasten/unfasten.
Summary: Attach to camera base, apply to tripod head, lock the lever with a minimal amount of force, level up the head and take photos. That's the beauty of dedicated kit. If you have two cameras and two plates, swapping cameras is quick and easy.
Summary: Probably fine for video but rather large for stills, especially if it is kept on the camera whilst hand holding. The screw fitting is old fshioned and means digging in the pocket for a coin. The 200 PL14 is a much better plate.
Summary: The 410pl is the same plate the you get with the manfrotto 410 geared head. You would normally put the mounting plate on your camera but with a spare you can have a second plate on a lens (where this is possible) like the 70-200. This lens has a mounting on it so you get the weight balance on the head.