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I forgot to mention one thing and clarify another:
The cheshire eyepiece alone can be used to collimate the optics.
The laser can be used to align the secondary, but its failing is in not being able to opitmize the position of the secondary mirror. That is, the secondary's vertical and horizontal positions. Its best position for general viewing is having it centred.
If you want to get really, really freaky about its position, you can "off-set" the mirror to take into account the geometry of the path of light. We are talking off-sets in the order of 1 to 2 mm in each the vertical and horizontal, with 2mm for the largest of scopes.
Me, I'd stick to centring the mirror, as the % of light loss from not off-setting isn't noticeable to our human eyes. It is something you'd consider if you where doing serious imaging or building your own scope and want to be pedantic on details.
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