It’s working well. My layout is not huge, but I’m getting range of 40-50 feet with no trouble. I don’t really need more than that, so I’ve never tested it beyond that. The response to the controls isn’t always consistent–sometimes the “slow” button works faster than others–that is, sometimes it slows down more quickly than other times.
I have 75 mhz units installed in an aristo pacific, an aristo mikado, a bachmann annie, and an old LGB mogul I kitbashed into a Thomas the Tank Engine for my daughter. They all can be operated from one transmitter. The Mikado gets the worst reception, I think because the antenna is inside the boiler shell. On the others I have the antenna running either along one of the handrails or on a tube. But it’s adequate with the Mikado.
It’s worth noting that Aristo is not going to be making any more 75 mhzs though–I remember reading on the Aristo forum that they can’t get some components any more. They’re bringing out a new 2.7 gig that’s supposed to be fabulous etc etc. It’s annoying. If I were starting from scratch I’d go with Airwire and the QSI controller–built in sound
Also it’s fairly sensitive to dirty track–it stutters and slows down. A few passes with the cleaning car generally take care of it.