Those pedals are not Shimano SPD compatible. Similar, but not exact. I have them and took them off because I have other pairs of pedals that are Shimano SPD compatible.
If you want multiple sets of SPD compatible pedals, just pick Shimano 520s off of Craigslist as they come up. Many people take them off their new bikes for something else. I see them pretty regularly for $20 a pair.
Or, the Ascent pedals from Performance are Shimano SPD compatible, and $5 more.