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I haven't used it in the Z yet but I do have it in my 1992 Stealth. It takes a 50:50 mix of MTL and MT-90 and it seems that the shifting is much smoother.
Its GREAT stuff, couldn't recommend it more, although I would just put MT-90 in, not a mix and not MTL. MTL is known to cause bearing and syncro wear in 300ZX transmissions. Its used as a last ditch effort if you know your gonna have to replace your transmission soon.
When I questioned Redline about what oil to use in the tranny they said to mix MT-90 and MTL 50:50 because our cars call for 75w/85 which is not 90w and has slightly different viscosity.