Those little Hitachi and Dewalt things are NOT cold saws. They are "dry cut saws", but a 100lb tool that is made from stampings, uses a little half horse or less plastic motor, and runs a carbide blade at a couple thousand rpm is a whole different beast from a cold saw.
Those little saws have their place- they are cheap and portable, and will work fine on thin wall or small stuff. The blades can be resharpened, but are more or less disposable after a couple of times.
A real cold saw will weigh 3 to 5 times as much, be made from really solid castings, and have a lot more power and torque. My Haberle is 3 1/2hp, and at 50 rpm or so, the torque is unbelievable. I can easily cut 2" solid square with it, pretty quick.
A real cold saw will have built in flood coolant- this is essential to keep the toothed carbon steel blade from burning up.
A real cold saw costs- because you are paying for mass, machining time, and qualtiy components.
If you can afford one, it will last forever, cut accurately, and handle material the little home depot saws could never do.
My saw, which I bought used in 92 from a production shop, is still tight and accurate, easy to set angles on, and should outlive me. You get what you pay for.
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