I was thinking about doing one or more of the BITD races next year and was wondering how they compare the the D37 H&H races. I've only ever done the first loop but I've done a couple of the Nationals first loops which weren't a cakewalk. Are the BITD courses more, equal to or less technical? Obviously they are a lot longer than 45 miles but if the terrain is easier then more miles doesn't take more skill, just more conditioning. Thanks for any input.