Boom preventer: Antal low-friction ring vs turning block opinions?

[JohnV]

Thanks for the replies--
Ben, those gizmos are such a break with tradition that I think most of us--at least true of myself--are hard-wired to overlook them.
Ian, that question was one of the reasons for my post. A bigger radius would be preferable, but in this application, is such a small radius still a problem even though the actual load is static, momentary and infrequent? I don't know the answer to that.
John