Any benefit to experiance with a graphics engine beyond level 3?

I know that hitting level 3 with a graphics engine will unlock research for the next level. Beyond that, is there any benefit to hitting experience level 4 and above?

I have also wondered about this. Actually, I’ve wondered if experience does anything. The only effects I know about are increasing salary and unlocking special training for employees. Yet your company gains experience in the individual dev stages as well…

An explanation of what experience means would be helpful to have as an in-game resource.