I have the ThermoWorks system so bought the RFX / Gateway when released. I used two probes on a turkey last month. Excellent connectivity and accurate readings (compared to a manual probe). The screen is a little different than the Signals screen I usually use but once I used it a bit, it was fine. I was satisfied with the system enough to order two more probes (4 total) during the initial period. I like that I can use them with my other ThermoWorks devices at the same time. The probes have a IP69K water resistance rating so I would assume dishwasher use would be okay, but I haven't specifically checked (I just hand wash my probes). The only negative I have found so far is each probe counts as one "device" in the ThermoWorks app, which has a free use limit of 6 at a time (the app's device limit is unlimited with a paid subscription). However, removing and adding back devices from the app is very easy.
I do have two Meater units (the original and a 2nd generation); I never use them.