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The telrad employs a zero magnification bullseye projected to infinity. This essentially means that there is a bullseye painted on the sky where your telescope is pointing that is not affected by how you look through your finder. If you move your head left, right, up or down the projected circles are still in the same place. This is much more convenient than with some of the more cheaply made red-dot finders where you must be looking from a specific, and sometimes inconvenient, angle.
The aspect of zero magnification can serve multiple purposes. The first is that it can quickly get you in the general area of your target of interest. If you are looking for some dim DSO's and will need to do some searching, then the Telrad gets you to the area really quickly and then sits by as you use your higher power finderscope to locate your object of interest. However, if you are only looking for some of the brighter, bigger objects (or that's all you can see becuase you live in light polluted skies like me) then the telrad is the last step becuase it is accurate enough to find most bright objects. I look the finderscopes off my 10” dob, my 8” sct and my 4” mak and only use the telrad.
If you have one, enjoy it! If you don't have one, get one!