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I use both a laser collimator and a 'cheshire' style eyepiece.
I use the cheshire first to sort out the secondary's situation first, and then the laser for the primary. The laser alone won't deal with secondary mirror's needs adequately.
I had only being using the laser for some time, and things where not working out the way they should. Then a mate suggested a cheshire, and 'presto', it all fell into place.
The 'cats eye' tool is very good too, as well as a barlowed laser.
You can make a deceptively effective 'cheshire eyepiece' from an old 35mm film canister with its lid. Use a 3mm or 4mm drill bit to make a hole through the centre of the lid and base. There are instructions on the net on how to use a cheshire collimation tool. This film canister version will take you to a point where the laser will finish of the collimation need. I use one of these diy film canister tools. Doubles as my focuser plug too.
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