I bought a 2.5 liter Harbor Freight unit about a year ago and used it a few times over the winter. I did a little bit of cleaning and a little bit of paint stripping with it, mainly on some smaller 3-rail postwar O-gauge freight cars and steam loco parts. Also a few small car parts and even a piece or two of my wife's jewelry. No concerns really, it worked pretty good for what I did with it.Does anyone have any concerns with the Harbor Freight Ultrasonic cleaner. Or do you have a favorite reasonably priced and larger unit to hold articulated engines HO SCALE?