Mine's been going for a while. Received it Fri, Sep 6, 2024 and it was in operation shortly after that replacing my RT97S repeater. I didn't really have a problem with the duplexer but I had asked the service team quite a few questions when all of a sudden they said they were sending out a duplexer. I didn't think I needed one but after I replaced it the reception was much better than it had been even from the 1st transmission. That was Sept 20th.
Before that they said you couldn't bring the voltage above 12.5v. After the new duplexer they said the limit was 13.8v
It's been working well for me on 600 with a Retevis 7.2dBi antenna. I have plans to get it way above the 40' it's currently at along with replacing it with a Comet CA-712EFC.