Maybe not a particular pair, but you have to have experience with any types of shoes. I would frequently buy two pairs, one I would normally train in and the ot

Maybe not a particular pair, but you have to have experience with any types of shoes. I would frequently buy two pairs, one I would normally train in and the other will be reserved for events. Even the pair reserved for event I would typically test run (hahaha!) at least once during training to spot any problems. Now, this is pure conjecture, I don't think the shoes magically make you more efficient. Efficiency is something you learn when running over long period of time. I would expect, to reap benefits of these shoes (assuming there are) you would need to get used to the new mechanics of running that the shoes will require.