People complain quite a bit about the MTH wireless drawbar but I've had no issues with the 3 locomotives I own that have it (Premier AC6 Cab Forward, Premier DMIR Yellowstone, and Premier ATSF 3460 class Hudson). I run on 072 curves and haven't had an issue with the drawbar coming out.
That being said it isn't the best design, and I say that because it's not idiot proof like the wire tether. The wireless drawbar leaves a lot of room for user error to cause issues.