I have another Diamond duplexer, that I bought in 1990. It’s been to hell and back, in the last 29 years, and it still performs perfectly. I needed two more duplexers and it was an easy decision, to go with Diamond, again. I’m using a Kenwood TS-790A, to communicate with AMSAT satellites. When transmitting on one band, and receiving on another, you need as much isolation as possible. Not having enough isolation, will desensitize the receiver, on the receiving band. I’m using the second duplexer, for a dual band radio, in my truck. These duplexers have been working great and I’m very happy with them. They’re very well made and I expect to get a long life out of these ones, as well.