Sorry for the delay, let me catch you all up.
JimmyC, I would suggest you sharpen the Concorde much the same as you would a Grizzly, but I find they are not as difficult. They do require some file work or similar, they are not ready to hunt by any stretch of the imagination, but I find them less time consuming than a Grizzly. The steel is good hard steel that holds an edge well, but requires less work than a Grizzly to achieve the same result.
SOS, John at Tusker tells me these are as close to 25 degrees as he can get them, which to my eye appears to be a bit shy of that. Not quite there, but close. I find I take less off the Tuskers than I do the Grizzlies when I sharpen to my preference if that gives you any idea.
pseman, these are definitely traditional heads and require some work for a hunting edge, less than a Grizzly but still probably not the best choice for the sharpening impaired.
Hope this helps, thanks for all the interest.
Tim @ Braveheart