Notably left out of the discussion of competitors in the current radio market is the new Radiomaster MT12. For $130 you get TOTL latency performance equivalent to radios in the $500+ range, 16 channels, excellent build quality (I had a chance to see one in person last weekend. It's a solidly built radio), hall sensors, USB-C charging, the most powerful OS on the market, and even cheaper receivers than the NB4. The only downside is the steep learning curve, but at the price that trade off seems worth it.

The biggest risk with any of the NB4's is what users are currently experiencing with the brand - as FlySky releases newer, more expensive models with new software features, the existing NB4 is being left to stagnate without any meaningful firmware updates. It's plain to see that FlySky is not interested in keeping the original NB4 up to date. You don't have to worry about that with an open source platform.