HI PMK,
July 15th 2015 I had the DESS module part number installed ( 710004190). Mileage at time of install was 6,994.
Then I had the DESS module part number installed again( 710004190) and Switch part number( 710004413), mileage of install was @ 8,740.00.
My spyder still has the above DESS and Switch part numbers, and the current mileage is 29,123.
I have not had any DESS errors.
Deanna