These guys were replaced by the Tokyo LD2 that has a FLYTEFOAM midsole and features a full-length Pebax plate that's been reworked with a 5-pin spike.
Think price and think comfort. Think what the LD stands for, Long Distance.
Now think about how much mileage you get through at training and the price of the new LD2 version, $180, at the time of writing this ad.
The lighter weight 4-pin spike plate with foam heel is so light it is almost like you are not wearing a shoe.