So I have used three of the BCS attachments thus far.
30" Rollerblade Flail Mower: A+ This thing is a beast and really devours and shreds everything it pushes over. Negatives? It can be a pain to hitch and unhitch due to alignment. Pry bar helps with stuck un mounts and making sure PTO spokes are prealigned helps with mounting. Was able to find things that were lost in turf like an old rubber hose and a utility cable tv run that should have been buried and are now disconnected with force.
30" BCS Power Harrow: B- Produces a very nice seed bed and the depth lever is easy to use. Negatives: The roller has two hex set screws to keep it centered that are not holding well even after tightening. When it slides out of alignment the roller binds on the side nuts of the frame and the roller drags. Also when being moved or cleaned on its side, two of the top covers are seeping oil. I think I am going to have to find some nylon spacers and/or some bolts with a smaller head diameter so this is not reoccurring issue.
Dozer Blade: A+ Reshaped and compressed a compost and brush pile with it. Good fun, effective, and would be even better in dualie wheel config. I got the box blade kit but I have not drilled the holes for it yet. Will need some time with the drill press.