The mulch is rather chunky but for speed and depending on what the end use is, this attachment seems to "tote the mail".
In my area we have many developments that were stopped back in the '08 crash that have been sitting vacant since then. Slowly the projects are being brought back to life and are covered in mostly small pines - 3-6" in diameter. I have several clients who either still own these parcels or new buyers looking to finish them out. There is nothing more aggravating that clearing the small pines as they break easily and hard to wad up without getting large amounts of dirt as well.
Land and trees like this -
https://www.youtube.com/watch?v=kgHPuPgIL5M
The chunky debris and small stumps left wouldn't be an issue as it would all be stripped and stocked as topsoil. The skid could tackle these trees quickly and efficiently, without using the 953 or D5. Any debris in the topsoil can always be wasted in a slope or other non-structural area.
over here in Aus , they are around $28k
I was figuring in the $18-20K range here in the US. That's not totally out of the spectrum if the project is the right size or multiple projects are on the horizon.
Also one could probably run a bush hog back over the cut area and reduce the size of the "mulch" if circumstances required it.