I have been testing the 9500i against the 8500 X50.
These are UNofficial and non-scientific in terms of the detector setup (both powered on and not in same windshield position, although their height and angle are almost the same), but real world in terms of actual LEO encounters.
Both detectors were powered on simultaneously. This never seemed to cause any falses or other stange behavior.
In fact, for the most part, they both alerted the same bands at the same time (give or take a few seconds).
Whether this arrangement may have caused one to react slower than the other is something I can't say for sure.
Both detectors in H mode.
9500i GPS off. SWS on.
I plan to run tests with the detectors' locations swapped and with only one powered at a time (especially when I find a "your speed is sign").
On X band, the 8500 X50 alerted sooner than the 9500i most of the time.
The signal strength often didn't get to ful alert on the 9500i.
HOWEVER, these were falses, so it could also be that the filtering is better on the 9500i.
I'll have to wait till I encounter a LEO with an X band radar gun to get a better feeling of X band radar gun detection.
Not enough data at this time.
I ran into 4 Ka (34.7 GHz) encounters tonight.
The first was with the 8500 X50 tilted slightly downward (20 degrees or less) due to the bend in the mount. It was slightly lower than the 9500i (only 1/2 - 3/4 inch).
The 9500i was to the left of the X50 by about 3 inches.
The LEO started out at a 90 degree angle to my right up ahead (stopped at a stop sign on a side street).
My 9500i (to the LEFT of the X50) alerted to Ka band at several hundred feet, while he was still stopped at the intersection.
My X50 remained quiet for 3 or 4 more seconds or so until I was MUCH closer to the LEO's patrol car (I don't even think I was 50 feet away by then!!!).
I don't know if the angle of the detector made a significant difference that could have accounted for this.
Encounter 2 (this was after having placed the X50 a little higher (1/2 inch below 9500i at the very most) and at an almost perpendicular angle to the road.
This time the X50 had a slight edge, but it wasn't by much and I think the ramp up on the two was about the same.
Unfortunately this was an officer approaching head on, so no right angle testing could be done.
Encounters 3 and 4 (two LEO's within half a mile, 10 seconds apart) - I don't recall offhand which one alerted first; it seemed pretty close. The 9500i may have been a bit quicker, but it was very close either way.
Ka 34.7 (34.737 - 34.741)
So far the 9500i has impressed me, especially the first encounter of the evening.
More to come.
I am looking forward to another 90 degree encounter now that the 8500 X50's mounting angle has been adjusted.
If I get the same results as before, the 9500i will stay * and the X50 will go.
The Ka alert tones on the 9500i seem more distinctive and clear.
* NOTE: I do not plan to use TruLock since I mostly have no need for it, except perhaps by my local supermarket where I would not be speeding anyway).
The detector is already very quiet, almost silent in 'A' mode until a LEO running radar is encountered.