I made this recipe for a party I was invited to today. I was hesitant and skeptical, since I feared the cake would turn out a soggy mess.
It was excellent, even though I made a mistake I won't repeat. I made the "fast-setting" jello recipe, and the gelatin poured over my 9" X 13" cake was thicker than it should have been and didn't penetrate deeply into the cake. It kinda' stayed on top and sides of the cake, and seeped only slightly into the poked holes.
It was still delicious, moist and flavorful. Your recipe should be more clear to use the normal jello recipe. (I also used a yellow cake mix, and it was still strikingly pretty and tasty).
Also, I wanted to liven up the Coolwhip so I added sprinkles to it just before serving. I was glad I waited, because the sprinkles just melted on the whipped topping, and would have looked unattractive had I sprinkled the decorations on earlier in the day.