Well, I've got 5 days in riding the Hawks and they are absolutely amazing. I don't know if I'll ever ride a "snowmobile" again. Hawks are snowmobiles as per the legal definition of a snowmobile, and as to what is allowed on snowmobile trails.
So far trail riding is all I've done and they perform wonderfully on the trials. I've riden about 375 -400 miles now and only went down once. That one time was on the 500 from RER. At the time I had not yet installed a trail adapter to it and was intentionally attacking the corners in my effort to learn the machine. Both the 600 and 800 had trail adapters when I got them and there has been no issue. I'm sure the 500 will perform equally well now that it has a trail adapter.
To all those that have heard of these machines and are curious, do yourself a favor and find a chance to try one. Seriously, you just have no idea what you are missing!!
Join me for HawkFest East in Lake Placid, March 12-14. There should be about 10-12 hawks and 10-15 sleds. Anyone there will let you try their Hawk.