I have been wearing the 1.75 5.11 TDU belt with Plastic buckle.
At first I was a bit apprehensive about the buckle lasting but after a few years now with zero problems and virtually no sign of wear, all concerns are allayed. I like that it wont scratch things, that it is light, and that I dont have to take it off for the man when flying. It is also relatively simple to put on and take off. I like that it is silent. No Velcro or clinking buckle. I also like the rock solid hold it has on my pants... after all that is what a belt is supposed to do.