Was wondering if anyone out there has any experience with using a split focus screen in the 5D Mark II?

Have access to some manual primes that I am thinking about using adaptors with. Expect to use liveview with the wider ones for landscapes, but am curious whether you find that changing the focus screen is worth it when using the viewfinder. Experimenting with MF and no IS using current lenses I am finding focusing consistently comes close, but not nailed for all shots, at least with normal and short telephoto.

Just hoping some of you have already gone down this path and could provide some recommendations.