This sems to work on a similar principle to the red dot finder on my scope, if it does then it doesnt actually shine a laser into the sky at your target but a very low powered image onto the glass screen at the front of it, a bit like a HUD. You still have to stand with your eye directly behind the finder to align the scope on the target. Here is a like to a more detailed description www.backyard-astro.com/equipment/accessories/telrad/telrad.html
Although mabey this isnt the same as the one you are asking about but it looks like it. Some of the other members may have used one of these finders and could tell you from experience.
Really I don't like unity power "finders", they don't show anything which can't be seen with the naked eye and the pointing accuracy is poor compared with something with magnification. As for laser pointers ... h8 h8 h8 ...
Paddy, the link is first class and tells me everything I need to know. The problem with my finder is that on my Dob it just seems to be in an awkward position and I've knocked it a few times trying to see through it and then needing to re-align it again. I think the Telrad finder will be a good idea to supplement the finderscope.