Made from tough polycarbonate and featuring a Boron steel spindle, the 577 series pedal is strong enough to handle some of the most demanding stuff physics will allow. Available in smoked or crystal clear finish, its as stylish as it is strong.
Strengths: low price, quite light, nice looks (i got white transparent)
Weaknesses: doesn't hold feet as good as aluminium pedals with metal pins
I changed from vp-559, wanted to lighten my bike a bit while staying with platforms, and keeping it low cost. If You ride light XC and don't want to clip-in, it will be fine, for more damanding use, when you need pedals to hold Your feet they wil fail.
lastly... they are more lenient for tibia than metal pinned ones ;)