As best as I have been able to tell, it arrived in good collimation itself (adjusting its rotation in the focuser did not change the location of the dot on the primary mirror), and the results in my images on an F4 scope reveal it is genuinely creating a well collimated setup, as the tolerance at F4 is rather tight.
The only way it would be better, is if the laser were a bit brighter, and if the beam were more consistently sharp when showing up on the acryllic screen when it returns from the secondary mirror. Sometimes it shows up as a nice dot and other times it seems rather smudgy. Still, results speak for themselves and it seems to be a very good product.

Neat piece of kit and it works. You certainly know when you have collimated your scope.

The Baader Laser Collimator was easy to use , and gives additional confirmation of the collimation provided by the collimation cap . It will be especially useful to tweak
the collimation ( if necessary) when the telescope is on the mount at night by small adjustment of the primary mirror screws . I have no issues with this product ..

The Baader Laser Collimator is a great peice of kit, well engineered, and make's collumating a breeze. It has been designed well so not to loose columation itself!
Only slight negative is that the batteries are very small and will sometimes flip when trying too drop them in toget the right polarity.

Having struggled with an ordinary Cheshire I decided to try a laser after seeing videos. Adjusting the secondary was a breeze, but due to the flat screen it took two of us to collimate the main mirror on my 12 inch Newtonian. The red dot on the screen was nice and bright and showed up clearly on the centre of the main mirror for the secondary adjustment. With lasers you can make the small adjustments as the locking nuts are tightened and re -check so easily any time. I didn't time it but it felt that the whole job took only a couple of minutes. Brilliant.

This is the best Budget Laser Collimator I have used. It's not going to break the bank. Most important of all, the collimator fires a single tight round laser dot. I have found it very good when collimating my F5 Newtonians.