If you have a third party option I would strongly suggest you look at a monster. I owned a billy goat and we had no problems, but when we needed an upgrade, the billy goat offering wasn't built in a way that would allow it to work for our application without modification right from the get go. We bought a monster trailer mount subaru 28 HP EFI 12" loader and have been very happy. While the billygoat does have the piranha blade, we found that the reduction was better with the monster. Further more both my dealer and I were amazed at how much more ruggedly the monster construction was compared to the billy goat.
just something to consider