I owned a set of Omega horns years ago. I had no issue other than they would get dirty and would need to be cleaned out(internal), but it wasn't hard. they lasted around 10 years and I could of bought the part to fix them but grew out of them. They are a lot of fun. But be very careful of where you are at when you hit them. I almost got in a few wrecks because I was close to train tracks and people would slam on there brakes!
In all I had a great time with them, they lasted for as long as I wanted them. And they are loud, I ran mine with 145PSI and they would sound like a train was behind you!