Yes yes yes!
Actually, I been carried away lately by my discovery of online window cleaners tips and tricks.. when I first started it was an Ettore brass fixed handle and channel with Ettore rubber to use, full stop. We all had to make it work there was no choice. It is amazing what a guy can get done with no choice and no internet LoL!
Having said that.. my discovery of the Liquidator in last few years has been great primarily because it lessens the constant pressure I have to exert on my simple Ettore tools to get the job done. I can get the same job done now with what feels like half the exertion. I feel all this mental taxation to get the Liquidator "just right" is worth it for the sake of my long term window cleaning body.
I use Ettore rubber in my Liquidator and the rubber works as well as it ever has, plus now even better I feel with the unique narrowed end slicing its way along.. I lube the Liquidator channel with soapy water before fitting in my soaped up Ettore rubber, I also agree with others here that the tighter fit of the Ettore rubber in the Moerman channel prevents movement, although with heavy squeegeeing all day long there is some movement away from the leading edge..