There's some good reading in those articles. The thing to remember about 'Radartest's' performance review of the Passport X50 and the Valentine is that the owner's of Radartest have a long standing relationship of hatrid with the owner of Valentine. So whether the X50 truly is better than the V-1 is still in debate, but regardless I love my original Escort 8500.
All of those laser jammers seemed to use 1 common focus point, the license plate. Sure, this is generally the first place that the police aim for, but once they can't get a lock, they just re-aim at the windshield. I don't believe the windshield slope has any negative effect on the laser's reading, it just may cause a slighter slower lock-on time.
You'll notice that in all the tests for the laser jamming, they stayed aimed at the same place, they didn't shift their aim as a real cop would of done. Tends to tell me that they may be giving you a false sense of security, the only real benefit would be if you get an audible warning for laser detection, and actually had the time to slow down before the re-aim/lock-on takes place.
It also does no good in states like mine, where a front license plate is not a requirement. And I don't plan on installing one just to use a radar jammer.
Summary.... From what was read:
Buy a 944, paint it black, don't install a front plate and don't drive with the pop up lights up. That would be the best defense from laser.