Sorry if I give that you impression. I do wish Radiomaster was paying me to spread the good word, lol. I'm just passionate about a good deal is all.

Regarding my post history. I just got started with the more serious RC cars. I've been flying planes since like 2010 but just built a Justock 21.5 equipped B6.4 for some spec indoor carpet racing this season. I literally just built it last week and have run it twice now at some localish places, Magic Hobbies and ARCS Raceway. I say localish because they are both still like 1.5 hours away. Funny story, but I actually decided to set it up on my airplane radio (stick radio) which is a Radiomaster Boxer JUST so I could use the existing Express LRS receivers I have. It's interesting that the MT12 came out so shortly after because I probably would have bought one if I hadn't already gotten a few hours of lapping on my stick radio. As it turns out it does not seem to slow me down, I think I'm doing pretty good for my first times on a track.

Regarding the binding, yeah it can be a bother till you get used to it. And yeah if you have two TX's using the same bind phrase it's going to screw stuff up. In practice conflicting bind phrases isn't too much of an issue, there aren't that many people in the hobby and as long as you aren't using "password" or something you should be fine.

Also, yeah they don't have a very clean model match configuration, though you can turn it on and it's mostly useful for having different "profiles" in your ExpressLRS module. ExpressLRS has a bunch of different packet modes. So if you have a long range FPV rover you would probably want to use the 50hz mode where you get the most range and latency isn't an issue. For your carpet buggy you probably want to use F1000 for the lowest latency. Or maybe 333Hz mode if you need something inbetween. So if you configure your models with a specific receiver number the ExpressLRS module will switch between packet modes automatically based on the active model. If the receiver number configured in the receiver does not match what is configured in the model in the radio, the receiver won't respond. That being said you should be careful about only having one model powered on at a time regardless.... If they have the same ID and both have telemetry turned on, I haven't tested this, but I believe what happens is telemetry quits working but the receivers both keep responding. In the fixed wing world its a known configuration to use multiple receivers to extend you pwm outputs you just have to turn off telemetry on all the receivers except for one. Then in the receivers, you can specify what PWM outputs are mapped to what over the air channels. So you could use two 6 output receivers and get 12 working channels out to your model. Not a thing for surface, but maybe with an excavator model or something.

If you want to talk REAL pita parts of expressLRS, it has this odd requirement for a few of the performacne features. The TL;DR of it all is while channel 5 is less than 1500uS the OTA link is variable and telemetry focused to make the LUA script work faster for configuring the receiver. Then if channel 5 is over 1500uS it transitions to a fixed lower telemetry rate and the OTA link becomes performance focused. The TX variable output power doesn't turn on until channel 5 is above 1500uS either. So when you set up the model in the radio, you need to keep this stipulation in mind. It's not documented very well by Radiomaster unfortunately. You can read more about it by googling "expresslrs why do you keep saying put arm on aux 1"

So I suppose there really is a gotcha for the price, it's complicated to use. But the performance is definitely real!