I think mine is a 2589. I got a lot of glare mounted on the windshield, but Tim said his was very clear installed on the tranny tunnel, so I mounted mine at the front of the tunnel, under the dash and it is MUCH better!
I bought mine new last year after Supercruise and it went out right before Springcruise this year. When I got home I called Garmin and returned mine and 3 or 4 days later I had a new unti, no charge. No problems with this unit.
One tip, I keep a couple small plastic sandwich bags under my seat in case of rain, I can throw it over the GPS and/or Radar Detector.