You really aren't looking to spike your insulin bro, you want your muscle to suck up as much glycogen as possible with the smallest insulin response as possible. r-ala will make your muscles absorb more glucose which will blunt the insulin response and still give you a good carb load without the potential for fat storage.
If you are an ecto, and are carb loading you might need to add in some more hi gi carbs with the r-ala or else you might not fill out like you want.
Now the only time I would agree that you would WANT the insulin release is if you are at real low bf levels and dieting hard, the insulin release with help ward of a catabolic state.