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I have HOTECH SCA 2" and find it very good. When I got it it was pretty spot on and didn't draw a circle. Then I dropped it on the floor and it went out of collimation, but I managed to collimate the laser in the telescope using the 2" adaptor. The 2" adaptor has very little play when rotated in my focuser so it was easy. I just tilted the primary so that the return beam misses the secondary and projected the spot on the wall 3-5 metres away.
The self-centering feature is great and works as advertised. The laser hits the primary within 1-2 mm of the centre every time I insert it. There still is some play in the focuser, tube flexure, etc but every time I collimate with it the result is very close to perfect when I check it with the cheshire or star-test.
95% of the time it is the only tool I use in my 12" f/5 Dob for collimation.
Cheers,
Alex
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