My 900 came this morning. I was pleasantly surprised at just how much has changed from the 800 physically. Every little nitpick and gripe I had about the 800 has been addressed and in big ways. The shafts, arm rest, grip, are ON POINT. Mine came with the battery really low so it is charging now; although I am not expecting any changes between it and the 800 performance wise. If your 600 or 800 is out of warranty or you don't want to wait for the Manticore...the 900 is worth every penny just for the physical improvements IMO.