I have a set of these and found them very poor. The stack height of the adapter plus the pedals guarantees they drag firmly on the ground when flipped over with the clip side down.

Also, they unbalance the SPD pedals so much that they hang completely upside down, not nearly vertically like quill pedals. Flipping them over to get your second foot into the clip is extremely difficult and there is no tab on them to assist getting the clip and strap on top.

Every stop was a hassle. I used them once and won't do it again.