UD2 taught me a TON about myself and carbohydrate manipulation. to me it is the epitome of the carb cycle as it is on the outer edge of extreme IMO especially as it pertains to the carb load.
u get to experience the pain required to fully deplete in 48-72hrs plus u get to witness the weight loss from water as well as the visual difference of being depleted and the weaker performance and carb cravings, then u get the full on effect of loading up on carbs (7000cals and 1300+ grams carbs in 30hrs) and replenishing as well as seeing the fullness and water weight and strength come back!
itll teach u a LOT about urself and diet and the carbohydrate macronutrient in general. it is a great stepping stone for learning diet IMO.
oh and getting to eat 7000cals in 30hrs primarily carbs is freaking awesome and at least worth one go round with the diet!