I think the STi is best. STi provides me more warning when there is a 35.5 Ka radar gun up ahead pointed away from me. IMO, STi is the best there is out right now. But the V1 and STi are both the 2 best detectors out right now and you can't go wrong with either one.
Look at the Over the Hill test:
http://www.guysoflidar.com/radar-det...ctor-test.html
Scroll up a little bit to check out the "Forward Facing Test":
http://www.guysoflidar.com/march-200...t.html#spectre
Base on my expereinces with the 2 V1's I have owned which were versions 3.825 and 3.858, overall I had more consistent advanced warning to 35.5 Ka radar with the STi which is the biggest radar threat in my area.
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