I owned the Gryphon Reference One amps for a few years. They were very good solid state amps but in comparison to the Lamm ML1.1, which I owned simultaneously, they were a bit coarse. I have 94 dB efficient speakers and it is possible that I was not using the Gryphons with loads where they would really shine compared to other amps (e.g 1-2 Ohm, 82 dB efficient speakers like MBLs). Also, they use an enormous amount of power and my electric bills were sky high; plus here in southern California, it was not possible to use them from May to September due to heat issues (that, or ratcheting my electric bills even higher by turning on the AC, which for me is whole house).
Given the apparently similar design of the Antileon series, I think they (at least in their monoblock signature form) should supercede the Reference Ones.
William