Holographic collimators

I'm thinking of replacing my point laser collimator with the holographic type so that I can better align my classical cassegrain optics. Can anybody shed some light 8) on how well they work?

My own experience is that they really help. You
can see the edges of the light cone -- whether
light path in centered on a secondary or corrector
plate, or centered in the tube, etc. The "tick marks"
are great -- you can count them and see how well
things are centered.

The "Barlowed Laser" is also very useful for Newts.
I think one really wants both kinds.

Bob,
I have the LaserMax and it has a great holographic grid. It helps with aligning the secondary and can be used without a center spot on the primary. You can see the secondary shadow to check the offset and centering of the secondary in the UTA or tube too.
I sold all my other lasers after a while, because I found this one to be the best. I had the Kendrick and Orion as well. Al were collimated properly and worked ok for collimation, but only the Lasermax was useful for the rest of the optical jobs.