After reading quite a bit about the Amiga's early development and what Jay, RJ and the guys were attempting to do by closely pairing software and custom hardware, IMO, no recent Amiga-ish development comes close to that level of hard/soft of integration. I think the newer Amiga-like OS's just "make do" with available chipsets and lack the attention to detail that made the classic systems so ingenuous.
Not to say that the newer systems dont have their own positive points, but I doubt they'll ever recapture that special something.
