While they are not near as bright as newer lights, I totally agree with the undercover aspect. I work nights mostly and have two sections of LEDs by the inch. The are in pretty much the same spot tucked up inside the headliner of my unmarked 2001 Crown Vic (you can't see where they are even if your sittting inside the car). I have a whelen visor light also in the windshield, but that's it up there (I have grille lights, strobes, HF,TLF, etc). The Sho-me's are plenty bright and keep my car from being recognized as an active police car. I don't wash it on the outside, don't use hub caps, have no visable antennas, have dark tint, and alot of body dings and dents. The car totally looks like an old police auctioned $500 car which are a dime a dozen in DC.
There is no way I could run any type of dash light or an interior lightbar and get the same results. Those thin lights are the only thing I have found I could get into the headliner.