I decided it would be appropriate to say something positive about BEL to balance some of my criticisms.
I like voice alert for band ID on the 940
X-Band is more sensitive on 940 than X-50, based on a stationary radar reference. I have access to (low-power intrusion detection). 2X distance on 940 vs. X-50. 3X distance V1 vs. X-50. Note that these are very close range tests, so one musn't extrapolate to highway "miles".
K and Ka band ranges seem fine.