Crower Cams

Has anyone here used the stage 3 cams that crower do?
They are good value for money compared to others. But their description makes it sound like an extrememly agressive cam that needs a lot of head work but the lift and duration specs are no more than a fast road cam from the likes of newman or cosworth.
any thoughts?
They are good value for money compared to others. But their description makes it sound like an extrememly agressive cam that needs a lot of head work but the lift and duration specs are no more than a fast road cam from the likes of newman or cosworth.
any thoughts?