The 5050 series pedals were completely redesigned by Crank Brothers in 2012. The 5050 "2" is the more budget oriented pedal, but still gets the two piece aluminum + polycarbonate platform and is much lighter than before.
These pedals are well worth the money. They have a strong, thin profile and are fairly lightweight. Most importantly, they are really grippy. Even in slick, muddy conditions, my shoes stick onto these platforms really well. They have helped me to become a more confident rider on more rugged terrain, and look pretty sick to boot! Highly recommended.