I just got my new Bel Sti Driver today and took it out for a drive for the first time to see how it compared to my Bel Vector 895 (S7). The area was a mixture of city and highway.
First impression, the Sti is very sensitive to X band. It always alerts first to X and sometimes my V895 remains silent when the Sti is alerting.
The V895 always alerts first to K band and sometimes the 895 is alerting to K when the Sti is silent. In a test with a roadside speed sign using K band, the 895 always alerted first with the Sti a second or two behind. The 895 also always alerts first to K falses from door openers.
I did run across a local Sheriff using Ka 35.5 and the Sti alerted first with the V895 a second or two behind. This was off axis at 90 degrees.
Well, so far it looks like the Sti and the v895 are very close in performance. I have also got alerts over 10 miles with this particular v895 on long open straight-aways on I-15 in Central Utah.
Both detectors were in Highway mode, POP off and SWS off.