It really depends how you ride...
Since theyre magnesium, the material is relatively soft, and if you tend to bash your pedals into everything, you'll lose pins pretty quickly.
However, if you keep your pedals off the floor, or train yourself to use only one side of the pedal, theyre a great way to instantly shave around 200g off the weight of your bike :o
I would say they are bigger/wider than V8s, pretty much as big as my Atom Labs (which are the biggest pedals ive ever used).
I'll probably get myself a set once the comps start actually, get rid of some weight from my beast :-"