I do not have it in the garage, but my porch and whole house except for the bedrooms and one bathroom are finished with the colored/textured concrete. I have radiant heat and I think the floor rocks! I never would have thought to put it in the interior of the house, but I must say, it beats the hell out of carpet for cleanliness and care.
It is nice with all the snow, to not have to fret over the floor so much.