The two items clearly have completely different functions. To compare same is frankly bizarre!
Having realised exactly what the PZ-109 is, I realised that I had one connected to my 70-200 f2.8! It is , as the shop states, designed to connect the camera, or in this case the lens to the tripod head. They are also commonly known as Swiss Arca plates, hence the confusion at times.
The PZ-109 will not allow you to quickly place the camera in portrait framing other than tilting your Tripod Head.
The whole idea behind L Brackets, and I quote from your site is: "Fast change from horizontal to vertical composition and viceversa without having to adjust your tripod and/or tripod head, while maintaining lens and viewfinder to eye-level relationship."
Both items fulfill different rolls and cannot possibly be compared.
Now then, for the umpteenth time! The MB-D200 WILL fit the D300! Whether you believe this or not is irrelevant to me but I would hope that at least someone may save some cash and keep their bracket to use on the D300.
Given that you have not tried the MB-D200, I find your ingrained beliefs rather odd!
Please listen, I have nothing to gain by lying! I use this combination daily!
You never know it may even fit my D700! If it does, you can be rest assured you will be the first to know - and probably ignore!
On a positive note, this was much more interesting than hearing that the D200 is a superior camera to the D300 and the D300 is superior to the D700 and .......... Jpegs are superior to Raw and ............. NX is superior to Lightroom ........ and Film will be here forever and .......... those sort of comments completely defy belief and completely lack substance!
The confusion with the MB-D200 and PZ-109 is, possibly, more understandable. Actually, no it isn`t, but it does correspond to a common theme on forums, which is why many people prefer not to join in the games!
I am now off to shoot tethered in my studio. Plug the D3 straight into my Macbook Pro running Aperture and away we go! No extra software needed! No doubt someone somewhere, who has never used Aperture will argue! On this point all I can say is the operation is seemless! NO "Work In Progress" here!
Oh well, back to my new IPhone! No, the MB-D200 doesn`t fit that!! Mind you, I haven`t tried - so maybe ...........