DVMatte PRo versus PriMatte (or buy an old copy of Shake) for chroma key project

Hello all.

I've done some basic green screen /chroma key work in the past. Using just the FCP and Motion tools. All been good enough for internet only projects. I am now embarking on a project that will be theatrically projected.

Everyone raves about Shake (but of course it's discontinued) but you can still buy old copies on Amazon.

Does anyone have any thoughts on DVMatte Pro, PriMatte or using an older version of Shake for simple actor against green screen work?

We shall presume that the video is perfectly lit (with good separation and detail to flyaway hair, etc.)

Editing in FCP 7 on a Mac Pro 12 Core

Apologies if this seems an oft asked question.

Cheers.