I bought an 8500 X50 from someone on Craigslist for $50 (Good deal), after using it a few days something wasn't right.
Cops running Constant On would be picked up right before I saw them, radar detector pointing right at two cops running constant on standing outside of their car and it doesn't even give me an alert until I'm past them. Very poor range on streets I used to get 2 miles alert on my Whistler. Tried it in multiple cars to make sure something wasn't interfering or the windshield had something going on in it.
So I ring up Escort's online service today and they tell me nothing seems wrong since K band still detects Walmarts and Walgreens. Right now I'm sure a low line Cobra could defeat this X50 on Ka. If the tech support thinks it's fine, I'm not going to blow $60 to have it checked out and just have it returned the way it was.
So time to sell the Escort and go on to a trusty Whistler Pro 78/Pro 78se since I know those work well for me here.