Mine has only given me trouble the last few days inside San Francisco multistory parking garages, and in tunnels, which does not surprise me.
Otherwise it is okay except for a sometimes faulty connection that seems to be at here at the the plug (near where you plug it into the power point, does anyone know were you can get a new plug for a Garmin 260 nuvi?)
I bought it in Las Vegas last year but here at the end of the plug is where the problem seems to be.
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1991 560 SEC AMG, 199k <---- 300 hp 10:1 ECE euro HV ...
1995 E 420, 170k "The Red Plum" (sold)
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2013 Jaguar XF, 20k <----340 hp Supercharged, All Wheel Drive

(sold)