I finally bit the bullet and purchased my grapple and diverter kit so I thought I would share some of my opinions and experiences along to the others to help them along in the process if they were considering a grapple or diverter valve purchase.
WR Long Diverter kit: First off, The system is incredibly easy to install. A couple large self tapping screws to install is all you need. I purchased mine with the hydraulic hoses included and all hoses were correct lengths for easy installation. Only had two issues: One was that the fitting ends for the hose from diverter to the hard lines had two different types of fittings. They ended up putting the same fittings on each on each end of the adapter hoses. A quick run to the hydraulic supply store, 15 dollars and two fittings later I was in business. The other issue I had which was no fault of the supplier was they supplied hoses for the implement. They were both 36" but after snapping a fitting I had found that a 48" and 60" will allow full range of the curl and closing the lid function.
Dirt Dog Grapple: General opinion is I am satisfied with the grapple. I haven't really had a chance to really stretch it's legs so to speak but the welds are solid and overall finish on the product is that is a well made product. I moved a significant amount of brush with it and it worked great. Used to push over several dead trees and then grapple the tree away. Pushed brush with it and even used to the lid to back blade to see if it would scarify some frozen ground which it did without any issues. I really wanted to try and move some large boulders with it but didn't have any reason to move any. No real issues with the unit. Its a solid unit, clamps well, great fit and finish and at 365# it is not overbearing on my JD 420 loader and the JD quick pins line up well.
Pic 1 Diverter valve installation
Pic 2 Grapple with lid fully opened
Pic 3 maximum curl with lid closed to show necessity of having a 48 and 60" hydraulic lines from the loader couplings to the implement.