New to here but not the Eco. I've had my 15 Granite Crystal BH CC 6'4" box for 2 years last month. Downsized from a 07 1500 Mega Cab Hemi. Love the fuel mileage difference with the Mega only getting 16.5 mpg and seeing 33 on the Eco at times. Do miss the interior space though. Only mods so far are Wade in-channel vent visors, Boss Air Bags and a Bakflip VP tonneau cover that is getting replaced due to premature design failure. Hope to go GDE some day but the exchange rate of the Cdn US $ is keeping this out of reach for the time being.