There is no difference between the Escort 8500 red and blue models. One just has blue led display and the other red. Some people like the blue because they think its easier on the eyes or maybe people wont try to use them as rabbits. A rabbit is someone who is speeding and being followed by other speeders that are using the 'rabbit' as a shield in case there is a speed trap ahead.
As I remember the old style
Beltronics RX65 and Escort 8500 are basically sister models using S7 platform. The current production Escort 8500 X50 and Beltronics RX65 models are again sister models using the M4 platform instead of the S7 and cost more money.
My opinion is that you should save and buy one of the top of the line radar models. The Valentine 1, Beltronics Redline and Escort 9500IX all have their own sets of good qualities and should be selected based on personal preferences and particular needs. If you cant afford that or aren't willing to spend the money just get the old style refurb 8500.
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