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The thing to remember with a laser is there are a couple of potential errors that can occur.
1. The laser itself may not be accurately built or collimated. If the alser beam is not parallel to the axis of the focuser it will never yield accurate results.
2. All a laser can tell you is about the angles of the mirrors relative to each other, especially with solid tube scopes. If you think about it, the laser beam that originates from the focuser could hit the secondary anywhere on its surface and you can tilt both mirrors to give a result that says the scope is collimated. It doesn't ensure that the secondary is aligned underneath the focuser or correctly positioned with the light cone generated by the primary. With a truss style scope it is possible to spot the secondary and use a laser to centre it, but still best to use other methods.
Malcolm
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